- Meeting abstract
- Open Access
2130 Improving signal-to-noise ratio in coronary mra with short acquisition windows using parallel imaging
© Yu et al; licensee BioMed Central Ltd. 2008
- Published: 22 October 2008
- Right Coronary Artery
- Parallel Imaging
- Sense Factor
- Coronary Magnetic Resonance Angiography
- Coronary Magnetic Resonance
In coronary magnetic resonance angiography (MRA), image data are typically collected during a short acquisition window (ACQ window) to minimize motion artifacts. This requirement limits the number of radiofrequency (RF) excitations per ACQ window and leads to prolonged scanning time. This could be addressed by shortening the repetition time (TR). Unfortunately, to shorten TR, shorter and stronger readout gradients are necessary and the subsequent increase in bandwidth results in a signal-to-noise ratio (SNR) loss. Alternatively, scanning time can be shortened through parallel imaging (SENSE) thus permitting the use of lower bandwidth and readout gradients with improved SNR.
To investigate whether the use of SENSE can be exploited to improve SNR in coronary MRA.
Some imaging parameters for SENSE = 1 and SENSE = 2 scans. Baseline scanning (Scans 1, 3) with a SENSE factor of 1 was performed using 12 RF excitation per RR interval. Two additional MRA (Scans 2, 4) at the same anatomical level but with a SENSE factor of 2 and 6 RF excitations only were also acquired.
BW/Hz per pix
a. Scan 1
b. Scan 2
c. Scan 3
d. Scan 4
We demonstrated that a reduced number of RF excitations and parallel imaging can be exploited to improve the SNR in coronary MRA with short ACQ windows. For ACQ windows of 70 ms and longer, this SNR benefit is small. However, for shorter acquisition windows, the gain is considerable. This may have important implications when trying to further reduce motion artifacts through shorter ACQ windows in coronary MRA .