- Open Access
Diagnostic performance of semi-quantitative and quantitative stress CMR perfusion analysis: a meta-analysis
Journal of Cardiovascular Magnetic Resonance volume 19, Article number: 92 (2017)
Stress cardiovascular magnetic resonance (CMR) perfusion imaging is a promising modality for the evaluation of coronary artery disease (CAD) due to high spatial resolution and absence of radiation. Semi-quantitative and quantitative analysis of CMR perfusion are based on signal-intensity curves produced during the first-pass of gadolinium contrast. Multiple semi-quantitative and quantitative parameters have been introduced. Diagnostic performance of these parameters varies extensively among studies and standardized protocols are lacking. This study aims to determine the diagnostic accuracy of semi- quantitative and quantitative CMR perfusion parameters, compared to multiple reference standards.
Pubmed, WebOfScience, and Embase were systematically searched using predefined criteria (3272 articles). A check for duplicates was performed (1967 articles). Eligibility and relevance of the articles was determined by two reviewers using pre-defined criteria. The primary data extraction was performed independently by two researchers with the use of a predefined template. Differences in extracted data were resolved by discussion between the two researchers. The quality of the included studies was assessed using the ‘Quality Assessment of Diagnostic Accuracy Studies Tool’ (QUADAS-2). True positives, false positives, true negatives, and false negatives were subtracted/calculated from the articles. The principal summary measures used to assess diagnostic accuracy were sensitivity, specificity, andarea under the receiver operating curve (AUC). Data was pooled according to analysis territory, reference standard and perfusion parameter.
Twenty-two articles were eligible based on the predefined study eligibility criteria. The pooled diagnostic accuracy for segment-, territory- and patient-based analyses showed good diagnostic performance with sensitivity of 0.88, 0.82, and 0.83, specificity of 0.72, 0.83, and 0.76 and AUC of 0.90, 0.84, and 0.87, respectively. In per territory analysis our results show similar diagnostic accuracy comparing anatomical (AUC 0.86(0.83–0.89)) and functional reference standards (AUC 0.88(0.84–0.90)). Only the per territory analysis sensitivity did not show significant heterogeneity. None of the groups showed signs of publication bias.
The clinical value of semi-quantitative and quantitative CMR perfusion analysis remains uncertain due to extensive inter-study heterogeneity and large differences in CMR perfusion acquisition protocols, reference standards, and methods of assessment of myocardial perfusion parameters. For wide spread implementation, standardization of CMR perfusion techniques is essential.
In recent years it has become apparent that information on the functional consequence of a stenosis in the coronary arteries is essential in prognostication and treatment of patients with coronary artery disease (CAD) [1,2,3]. Invasive coronary angiography is the current gold standard for the assessment of CAD according to the ESC guidelines [4, 5]. Fractional flow reserve (FFR) measurements are used to assess the functional significance by determining the pressure drop over an epicardial stenosis . The disadvantage of invasive coronary angiography is that it is an invasive procedure, exposing patients to procedural risks and radiation [7,8,9,10,11]. In addition, in up to 60% of the patients undergoing invasive angiography, no significant stenosis is present suggesting that the pre-selection of patients for invasive coronary angiography can be improved .
A variety of noninvasive imaging modalities exists which show potential to be used in the (functional) assessment of patients suspected of CAD. These modalities include positron emission tomography (PET), cardiovascular magnetic resonance (CMR), computed tomography (CT), and single-photon emission computed tomography (SPECT). The different myocardial perfusion imaging (MPI) modalities all show a high diagnostic accuracy with an area under the curve (AUC) of 0.95 (0.91–0.99) for CMR perfusion imaging in general compared to 0.93 for PET, 0.93 for CT, and 0.82 for SPECT, respectively . A disadvantage of MPI performed with either PET, SPECT or CT is the radiation exposure during the examination [11, 14].
MPI by stress CMR perfusion combines a high spatial resolution with the absence of radiation. These features make CMR perfusion an interesting modality for routine clinical assessment of CAD. The diagnostic accuracy of CMR perfusion imaging has been assessed in multiple studies and recent meta-analyses have provided extensive overviews of available evidence [13, 15,16,17,18], however these meta-analyses do not discriminate between qualitative and quantitative assessment. Currently, the visual assessment of perfusion defects is used in clinical practice .Visual assessment however, is subjective and highly dependent on expertise. However, analysis of the signal-intensity curves (SI-curves) that can be acquired during the first wash-in of the paramagnetic contrast agent gadolinium have potential to provide quantitative information on myocardial perfusion. These SI-curves to evaluate the myocardial blood flow (MBF) can be evaluated by semi-quantitative or quantitative methods . The semi-quantitative method is based on the maximal upslope of the tissue attenuation curve (TAC) . The quantitative method is based on model dependent deconvolution using the SI-curves. A variety of tracer kinetic models are used providing a MBF value related to the physiological MBF . There are various proposed models for model dependent deconvolution with varying complexity. Both the semi-quantitative and quantitative parameters can be analyzed relatively as a ratio between values during stress and rest MPI or as absolute values. Although a large number of studies have been performed, meta-analysis of CMR perfusion available to date did not evaluate the diagnostic performance of these semi-quantitative and quantitative analysis of the SI-curves acquired during the first-pass perfusion.
Therefore, the aim of this meta-analysis was to assess the diagnostic accuracy of semi-quantitative or quantitative CMR perfusion imaging analysis based on SI time (SI-curves) as compared to either anatomical(quantitative coronary angiography (QCA)) or functional reference standards (invasive coronary angiography +/− FFR) in patients with suspected or known CAD.
Protocol and registration
This meta-analysis was performed in concordance with the Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) statement and was registered at PROSPERO (http://www.crd.york.ac.uk/PROSPERO/display_record.asp?ID=CRD42016040176) under registration number: 42016040176).
To produce an extensive overview of the diagnostic accuracy of both semi-quantitative and quantitative CMR perfusion analysis, the following criteria to determine eligibility where used: study domain – patients with known or suspected CAD. Index test – quantitative or semi-quantitative CMR perfusion. Reference standard – invasive coronary angiography +/− FFR and QCA. Study results – diagnostic accuracy of index test compared to reference standard. Study design – observational. Overlap in study population between studies was corrected for by only including the study with the highest number of patients. Studies evaluating visual CMR perfusion outcome measures not based on time intensity curves, evaluation on a segmental basis, animal studies, phantom studies, and dose ranging studies were excluded from both the qualitative and quantitative analysis. Furthermore, reviews and overview documents were excluded from the quantitative analysis.
The following search strategy was used in Pubmed: (“Myocardial Ischemia”[Mesh] OR myocardial OR cardiac OR “coronary artery”) AND (“Magnetic Resonance Imaging”[Mesh] OR Magnetic Resonance[tiab] OR mri[tiab] OR MRP[tiab]) AND (“Perfusion Imaging”[Mesh] OR perfusion[tiab]) AND (Quantification*[tiab] OR quantitative[tiab] OR deconvolut*[tiab] OR myocardial perfusion reserve[tiab] OR mpr[tiab] OR semiquantitative [tiab] OR semiquantitative [tiab] OR semiquantitative OR MPRI [tiab] OR myocardial blood flow [tiab] OR MBF [tiab] OR contrast enhancement ratio [tiab] OR left ventricular upslope [tiab] OR upslope integral [tiab] OR CER [tiab] OR SLP [tiab] OR INT [tiab]). Additionally, Embase and Web of Science were searched using adjusted search strategy to fit the search matrix of the source.
The search strategy was set-up in collaboration with the local Medical Library (Central Medical Library University Medical Center Groningen). One researcher (RvD) executed the search and gathered the results in Mendeley (version 1.16.1). A check for duplicates was performed with both the built in ‘check for duplicates’ function as well as manually (RvD). Screening for study eligibility and relevance of the articles retrieved by the search strategy was performed individually by two reviewers (RvD and MvA) using the pre-defined study eligibility criteria. Studies were categorized as includable, possibly includable, non-includable by screening the titles and abstracts. Inter-reviewer categorization was compared and in case of disagreement discussed to obtain consensus.
Data collection process
The primary data extraction was performed independently by both researchers (RvD and MvA) with the use of a predefined template. Data extraction was cross checked and discussed to achieve consensus. In case of missing or unclear data the corresponding authors were contacted (n = 12), in absence of a response the studies were excluded.
The following patient characteristics were collected: age, gender, prevalence of CAD, and coronary artery disease risk factors. Data on study design was collected, including: prospective/retrospective set up, number of patients enrolled, number of patients excluded, scanner type and manufacturer, stressor agent and dose, contrast agent, perfusion sequence, cardiac segmentation method, reference standard, outcome measures with reported sensitivity, specificity, negative predictive value, positive predictive. The number of true positives (TP), false positives (FP), true negatives (TN), and false negatives (FN) were derived directly from the article or calculated from the sensitivity and specificity reported in the articles. All the figures and tables in this article are original for this article.
Two reviewers (RvD and MvA) independently evaluated the study quality of the included studies using the ‘Quality Assessment of Diagnostic Accuracy Studies Tool’ (QUADAS-2) . Risk of bias was assessed across all studies and within each individual study using RevMan software (version 5.3.5, Cochrane collaboration).
The principal summary measures used to assess diagnostic accuracy were sensitivity, specificity, Diagnostic Odds Ratio (DOR), and AUC. In case studies performed multiple semi-quantitative or quantitative analyses we chose the maximal upslope parameter as a representative measure for semi-quantitative analysis and absolute MBF for quantitative analysis. Furthermore, transmural ratios were used when studies reported sub-endocardial, sub-epicardial, and transmural outcomes. When multiple tracer kinetic models were used for quantitative analysis, the Fermi model was selected. When both a semi-quantitative and a quantitative outcome, or both 1.5 T as well as 3.0 T were used, both outcomes were taken into account for the analysis.
The primary data synthesis was based on bivariate mixed-effects binary regression modeling. Sensitivity, specificity, and heterogeneity (using the Q-statistic and I2 index) were calculated and displayed in forest plots. Significant heterogeneity was defined as Q-statistic p < 0.10 and/or I2 > 50%. Separate subgroup forest plots were evaluated when >5 studies were available.
The Deeks’ funnel test was used to test for publication bias, with a value <0.05 indicative of publication bias or systematic difference between results of larger and smaller studies. The DORs were used to calculate the summary receiver operating curves (sROC). Based on the ROC curves the AUC was calculated. Data analysis was performed with STATA (version 13.0; STATA corporation, Lakeway Drive, College Station, Texas, USA).
The systematic search in Pubmed, WebOfScience, and Embase identified 3272 articles. After the removal of duplicates, 1967 articles were screened based on title and abstract. The resulting 137 articles were assessed in full text for eligibility. Of these, 23 articles were deemed eligible based on the predefined study eligibility criteria including a total of patients, with mean age ranging from 57 to 67 years. The PRISMA flowchart is shown in Fig. 1. The final analysis included 22 articles due to exclusion of one study using dobutamine as a stressor agent in which an inadequate heart rate response for diagnosis was achieved in most age groups.
Studies were performed at 1.5 T in 20 (91%) studies and at 3 T in 6 (27%) studies (Bernhardt et al. used both 1.5 T as well as 3.0 T). The stressor agent used was either adenosine or dipyridamole in 18 (82%) and 6 (27%), studies, respectively. Segment based outcome data was available in 4 (18%) of all studies, territory based outcome data was available in 13 (59%) and patient based outcome data in 11 (50%) studies included (Bertschinger et al. and Papanastasiou et al. reported both territory and patient based data). Perfusion analysis was performed semi-quantitative in 16 (73%) studies and quantitative in 10 (45%) (Huber et al. and Mordini et al. reported data on both semi-quantitative and quantitative analysis). The reference standard was anatomical in 15 (68%) studies and functional in 11 (50%). See Tables 1, 2 and 3.
Four studies with per segment-based analysis could be included, all using an anatomical reference method (QCA). Segment-based pooled sensitivity, specificity, and DOR were 0.88 (95% CI, 0.82–0.93), 0.72 (95%CI, 0.56–0.84), and 19 (95% CI, 9–40), respectively. ROC curve analysis showed an AUC of 0.90 (95% CI, 0.87–0.92). See Table 4 and Figs. 2 and 3.
Eleven studies were included analyzing the perfusion data on a per territory basis with Huber et al.  reporting on both semi-quantitative and quantitative analysis, including twelve study outcomes in the final per territory analysis. Territory-based pooled sensitivity, specificity, and DOR were 0.82 (95% CI, 0.77–0.86), 0.83 (95% CI, 0.74–0.90), and 21 (95% CI, 10–45), respectively. ROC curve analysis showed an AUC of 0.84 (95% CI, 0.81–0.87). See Table 4 and Figs. 4 and 5 . Quantitative analysis (n = 6) on a per territory base yielded a sensitivity, specificity, and DOR of 0.77 (95% CI, 0.62–0.87), 0.86 (95% CI, 0.72–0.94), and 21 (95% CI, 6–8) with an AUC of 0.88 (95% CI, 0.85–0.91), while semi-quantitative analysis (n = 6) yielded a sensitivity and specificity of 0.77 (95% CI, 0.60–0.88) and 0.84 (95% CI, 0.76–0.89) with an AUC of 0.87 (95% CI, 0.84–0.90). Using a functional reference (n = 7) standard yielded a sensitivity, specificity, and DOR of 0.77 (95% CI, 0.63–0.86), 0.85 (95% CI, 0.73–0.92), and 18 (95% CI, 6–59) with an AUC of 0.88 (95% CI, 0.84–0.90), while the use of an anatomical reference (n = 5) showed sensitivity, specificity, and DOR of 0.85 (95% CI 0.78–0.90), 0.83 (95% CI, 0.72–0.91), and 28 (95% CI, 13–63) with an AUC of 0.86 (95% CI, 0.83–0.89).
Eight studies were included analyzing the CMR perfusion data on a per patient basis, of which Mordini et al.  reported on both semi-quantitative and quantitative outcome and Bernhardt et al.  performed analysis at both 1.5 T and 3.0 T, in the end including ten study outcomes in the final per patient analysis. Six had an anatomical reference standard and 4 a functional reference standard. Patient based sensitivity, specificity, and DOR were 0.83 (95% CI, 0.75–0.88), 0.76 (95% CI, 0.65–0.85), and 15 (95%CI 6–36). ROC curve analysis showed an AUC of 0.87 (95% CI, 0.84–0.90). See Table 4 and Figs. 6 and 7.
Diagnostic accuracy in patients with decreased left ventricular ejection fraction or multi-vessel disease
The study of Krittayaphong et al. reported on the diagnostic accuracy of MPRI in patients with decreased left ventrticular ejection fraction (LVEF). They report a decreased sensitivity, specificity and diagnostic accuracy in the subgroup of patients with decreased LVEF (sensitivity 88.9%, specificity 58.3% and diagnostic accuracy 71.5) as compared to patients with normal LVEF (sensitivity 89.7%, specificity 93.8% and diagnostic accuracy 91.1). Mordini et al. report that all their patients with multivessel disease (n = 7) were correctly identified with quantitative perfusion analysis. Giang et al. present a similar sensitivity and specificity whether patients with three vessel disease were included or not across all tested doses (e.g. 94/71% sensitivity/specificity when patients with three vessel disease included at dose 3 compared to a 91%/71% sensitivity/specificity when patients with three vessel disease excluded).
Study quality assessment and publication bias
The overall methodological quality of the studies was good See Figs. 10 and 11. The per territory analysis pooled sensitivity, per territory anatomical reference standard sensitivity and per territory semi-quantitative specificity did not show significant heterogeneity See Figs. 2, 4, 6 and Table 4. The Deeks’ Funnel plots did not indicate publication bias or systematic difference between results of larger and smaller studies See Figs. 8 and 9.
Summary of evidence
The pooled diagnostic accuracy for segment-, territory- and patient-based analyses showed good diagnostic performance. The diagnostic accuracy of CMR perfusion analysis has been assessed in previous meta-analyses [13, 15,16,17,18]. However, this meta-analysis is the first focusing on the semi-quantitative and quantitative analysis of the SI-curves. The diagnostic accuracy of CMR perfusion (pooled for visual, semi-quantitative, and quantitative analysis) reported in the earlier meta-analyses range from AUC 0.90 to 0.94 [13, 15,16,17,18]. When comparing our results, the SI-curve based analysis of CMR perfusion does not lead to an increase in the diagnostic accuracy as compared to the combined diagnostic accuracy of CMR perfusion as reported in these previous papers. Visual analysis of CMR perfusion does not yield lower diagnostic accuracy. This is possibly due to the fact that visual observations are made upon fewer and less complex assumptions than both the semi-quantitative and quantitative analysis methods that are used. Both semi-quantitative and quantitative perfusion analysis are based on SI-curves and calculate a derivative of myocardial blood flow based on certain assumptions. The models used for quantitative analysis are mathematical representations of a physiological process and rely on assumptions made about the dynamic of contrast and blood plasma and pre-existing knowledge about the physiologic process and model dynamics. In these models it is assumed that there is no diffusion of contrast medium into the intracellular space. Unfortunately, only in a few specific contrast agents this is the case. Different models are used for CMR perfusion analysis, with different degrees of complexity, and the optimal model is yet to be determined. The complexity of this modeling process, the many assumptions made and thereby the selection of a suitable model makes model-dependent perfusion analysis highly susceptible to error and with inconsistent results as a consequence. The use of different models with varying results could add to the heterogeneity in the quantitative analysis group. Semi-quantitative analysis, although in theory inferior to quantitative analysis, is a relatively simple method to estimate perfusion. The low complexity of these methods make it a robust method, allowing for less variation among research groups. As visual CMR perfusion analysis is relatively simple as compared to either semi-quantitative and/or quantitative CMR perfusion analysis, it is possible that this method is less susceptible to methodological errors (causing false conclusions). However, the methods used for assessing semi-quantitative CMR perfusion also vary within studies. The large variation in both semi-quantitative and quantitative CMR perfusion post processing techniques make it challenging to make an accurate comparison due to extensive inter-study heterogeneity. We compared the diagnostic accuracy of semi-quantitative and quantitative CMR perfusion analysis on a per territory basis and observed that the diagnostic accuracy slightly decreased using quantitative analysis (AUC of 0.87(0.83–0.89) compared to 0.81(0.78–0.85)). This is possibly due to the fact that quantitative analysis is based on multiple assumptions.
If the noninvasive MPI techniques are to be used as a gatekeeper for further diagnosis and treatment it is important to select a modality in which the amount of false negative results is low to assure that patients with significant disease are not missed. This requires the sensitivity of the gatekeeper test to be high. We were also performed subgroup analyses in the per territory group, based on the reference standards used. The anatomical reference standards merely depict the presence or absence of epicardial coronary stenosis (visual invasive coronary angiography, QCA), whereas the functional reference standards contained functional information on either pressure drop across the stenosis (FFR).
Our results show similar diagnostic accuracy when anatomical reference standards were used (0.85(0.82–0.88)) as compared to the diagnostic accuracy of SI-curve analysis with the use of functional reference standards (0.82(0.79–0.86)) in the per territory analysis.
For the anatomical reference standard, a DS >50, >70% or >75% were generally used as the cut-off value for significant CAD in both QCA and visual angiographic assessment. For the functional reference standard, a FFR of either <0.75 or <0.8 were used to indicate significant CAD. The accuracy of the anatomical reference standards as well as the currently used gold standard for functional reference of invasive coronary angiography +/− FFR for determining flow limiting CAD are debatable. Furthermore, pooling of the different threshold also increases heterogeneity in this meta-analysis. Previous research has shown that the anatomical presence of a stenosis, with cut-off values of either >50% DS or >70% DS have a poor correlation with FFR . The use of the functional FFR measurement to guide therapy has proven to be superior as compared to anatomical assessment alone . The FFR measurement is based on the measurement of a pressure drop across an epicardial vessel pre- and post-stenosis and a value of either <0.75 or a more liberal cut-off of <0.8 is used to indicate a functionally significant epicardial stenosis. However, what both the anatomical reference standard and the functional FFR measurement ignore microvasculature perfusion defects and the assumptions of a linear relationship between increasing stenosis or decreasing pressure with decreasing flow is made. To better understand the myocardial perfusion, van de Hoef et al. aimed to determine the relationship between invasively measured FFR and coronary flow reserve. The results of this study indicate a non-linear relationship between FFR (pressure drop information) and coronary flow reserve (flow information). The authors conclude that the disagreement between FFR and coronary flow reserve is caused by the involvement of the microvasculature and this indicates that the functional FFR measurement is not an accurate representation of myocardial perfusion . We believe that there is a trend towards a better understanding of the complex process of myocardial perfusion and that the currently used reference standard as of yet fail to accurately represent myocardial perfusion. The need for a well validated and robust measurement technique for measuring myocardial perfusion is necessary and this technique might be used in the future as the gold standard. The inability of both the anatomical and functional reference standards to accurately represent myocardial blood flow might have influenced the results and so the results of this meta-analysis should be interpreted with caution.
Further research is necessary to determine the ideal golden standard for myocardial perfusion. We emphasize that it might be beneficial to first critically review phantom or ex-vivo research regarding the determination of myocardial perfusion in search for the measurement which represents true myocardial blood flow as accurately as possible.
In our meta-analysis we found an extensive variation in study population, CMR protocols, post processing techniques, and reference standards used. The lack of standardized CMR perfusion protocols or post processing techniques might have influenced our estimates of a lower diagnostic accuracy than expected of semi-quantitative and quantitative CMR perfusion analysis as compared to visual assessment. The extensive heterogeneity between the study protocols should be taken into account in the interpretation of these results. Standardization of the analysis protocols is needed to make more generalizable recommendations.
Future research should focus on the construction of a quantitative model that accurately depicts physiological myocardial blood flow. The different quantitative models should be compared and validated within a well-structured standardized CMR perfusion protocol preferably against a well validated perfusion method to determine which of the models accurately describes the perfusion process. Specific cut-off values to distinguish between normal and ischemic myocardium should be determined, and CMR protocols should be calibrated between the different CMR scanners. Visual CMR perfusion analysis alone is already highly accurate in the assessment of significant CAD and might also benefit from standardization of CMR protocols. The included studies reported results per segment, vessel territory or per patient. In this study we chose to include all three groups and report the results separately. However, it should be noted that a per segment based analysis holds more anatomical value since CAD often involves only specific coronary branches and not an entire vessel, affecting an entire vessel territory. This could have resulted in a lower diagnostic accuracy for the territory based results. The per territory analysis however, has a high clinical value since intervention more likely target the main coronary vessels instead of the secondary branches.
The main limitations for this meta-analysis is the small number of studies available regarding either segment, territory or patient based semi-quantitative or quantitative analysis of SI-curves in the assessment of myocardial perfusion using CMR and the wide variety of CMR protocols used in these studies. This resulted in a high degree of heterogeneity and possible bias making inter-study comparison difficult. Furthermore, there was an overrepresentation of male patients in the included studies. This limitation makes the findings less generalizable for women. We also decided not to include visual CMR perfusion analysis as the diagnostic accuracy of this assessment has been assessed in previous meta-analyses and our aim was to explore the diagnostic accuracy of SI-curve based assessment.
Another limitation regarding this meta-analysis are the wide variety of reference standards used. We decided to pool all reference standards used to provide a more complete overview of the evidence regarding SI-curve analysis during CMR perfusion. For our subgroup analysis we decided to group reference standards on either providing anatomical or functional information and observed a difference in diagnostic accuracy when using either anatomical or functional reference standards.
We conclude that the reference standard used has an influence on the diagnostic accuracy of SI-curve CMR-perfusion analysis and discussed the unclear relationship of both currently used anatomical and functional reference standards with myocardial flow and perfusion.
This meta-analysis provides an overview of 23 original studies reporting on the diagnostic accuracy of semi-quantitative or quantitative analysis of stress CMR perfusion on a per segment, per territory or per patient basis for the assessment of significant CAD. Based on our results we conclude that due to a high degree of inter-study heterogeneity the real value of signal intensity curve based analyses of stress CMR perfusion still remains unclear. Semi-quantitative analysis showed a higher diagnostic accuracy for per territory analysis in this meta-analysis, possibly because it is less complex and less susceptible to false assumptions during the calculation. However, quantitative analysis still shows the potential to be used for absolute quantification of myocardial blood flow and further studies should be performed to determine the quantitative model that best represent true myocardial blood flow. The standardization and validation of semi-quantitative or quantitative stress CMR perfusion is necessary before it can be safely implemented in clinical practice.
Area under the curve
Coronary artery disease
Cardiovascular magnetic resonance
Diagnostic odds ratio
Fractional flow reserve
Left ventricular ejection fraction
Myocardial blood flow
Myocardial perfusion imaging
Positron emission tomography
Quantitative coronary angiography
Single-photon emission computed tomography
Summary receiver operating curve
Tissue attenuation curve
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The original publication of this article has been updated, figures 8 , 9, 10 and 11 have been corrected. Full corrections details are provided in the Publisher correction.
A correction to this article is available online at https://doi.org/10.1186/s12968-017-0421-z.
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van Dijk, R., van Assen, M., Vliegenthart, R. et al. Diagnostic performance of semi-quantitative and quantitative stress CMR perfusion analysis: a meta-analysis. J Cardiovasc Magn Reson 19, 92 (2017). https://doi.org/10.1186/s12968-017-0393-z
- Magnetic resonance imaging
- Coronary artery disease
- Myocardial perfusion imaging