- Oral presentation
- Open Access
Navigator guided high-resolution single-shot black-blood (BB) TSE images using zoom and sensitivity encoding (sense) on a 32 channel RF system
© Muthupillai et al; licensee BioMed Central Ltd. 2010
Published: 21 January 2010
Although time consuming, double-inversion recovery prepared black-blood TSE imaging (BBI) techniques form the back bone of tissue characterization in cardiac MRI. While SSH-BBI is feasible, to-date, the spatial resolution of such SSH-BBI is intrinsically limited by the T2 decay induced blurring associated with the length of the readout duration. We hypothesize that by restricting the cranio-caudal FOV to the heart using the ZOOM technique (which applies the 90 and 180 degree RF pulses orthogonal to each other), and by applying SENSE in the FH/RL direction with a 32 channel coil, it is feasible to obtain high-resolution single-shot BBI.
The purpose of this work is to test the feasibility of this hypothesis in a clinical setting.
All imaging was done on 1.5 T Philips scanner with 32 RF channels and VCG gating in 7 subjects(6 M, age: 36 ± 6 yrs). The baseline SSH-BBI sequence (Base) had a TSE readout duration of 436 ms. This readout duration was decreased to 260 ms by applying SENSE (factor = 2), and further to 164 ms by restricting the FOV by 50% in the FH/RL direction using ZOOM, and by using SENSE in the FH/RL direction (by a factor = 2). The following acquisition parameters were kept constant across all three sequences: acquired voxel size 1.5 × 2.0 × 8.0 mm3; TR/EffTE: Infinity/80 ms; bandwidth per pixel: 500-520 Hz. Only the half-scan parameter was adjusted to yield the same EffTE for all three sequences. A respiratory navigator positioned at the level of the diaphragm triggered each slice acquisition eliminating the need for breath-holding.
High resolution SSH-BB TSE images can be obtained during free breathing with minimal blurring by a combination of SENSE and ZOOM imaging techniques.
This article is published under license to BioMed Central Ltd.