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Radial cardiac T 2 mapping with alternating T 2 preparation intrinsically introduces motion correction

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a) Schematic of the alternating acquisition pattern. The T2Prep duration is alternated between 60, 30 and 0 (no T2Prep) ms from heartbeat to heartbeat. All images are acquired in an interleaved fashion and on average experience similar motion. b) Schematic of the conventional sequential acquisition pattern. The T2Prep duration is changed only after acquisition of an image. This approach may be more vulnerable to irregular heart rates or respiration patterns. c) Simulations of stability of fitted T2 values for both methods against heart rate variation. For an input T2 of 45 ms, both the alternating acquisition (solid line) and the sequential acquisition (dashed line) result in a T2 variation of ~3 ms over the range of physiological heart rates.
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Figure 1: a) Schematic of the alternating acquisition pattern. The T2Prep duration is alternated between 60, 30 and 0 (no T2Prep) ms from heartbeat to heartbeat. All images are acquired in an interleaved fashion and on average experience similar motion. b) Schematic of the conventional sequential acquisition pattern. The T2Prep duration is changed only after acquisition of an image. This approach may be more vulnerable to irregular heart rates or respiration patterns. c) Simulations of stability of fitted T2 values for both methods against heart rate variation. For an input T2 of 45 ms, both the alternating acquisition (solid line) and the sequential acquisition (dashed line) result in a T2 variation of ~3 ms over the range of physiological heart rates.

Mentions: T2 mapping through variation of the T2 preparation (T2Prep) duration has been increasingly used to robustly detect and quantify cardiac edema (Giri et al., JCardiovMagnReson2009). However, if images with incremental T2Prep duration are acquired in a sequential fashion, irregular breathing patterns and heart rates may adversely affect the quality of the T2 maps due to misalignment of the source images. A logical alternative is then to acquire all images in an alternating manner (Figure 1ab), where the T2Prep duration changes cyclically from one heartbeat to the next. Combined with a radial signal readout, this may minimize the vulnerability to respiratory or RR variability. We therefore simulated, implemented and tested the utility of an alternating magnetization preparation approach to T2 mapping.


Radial cardiac T 2 mapping with alternating T 2 preparation intrinsically introduces motion correction
a) Schematic of the alternating acquisition pattern. The T2Prep duration is alternated between 60, 30 and 0 (no T2Prep) ms from heartbeat to heartbeat. All images are acquired in an interleaved fashion and on average experience similar motion. b) Schematic of the conventional sequential acquisition pattern. The T2Prep duration is changed only after acquisition of an image. This approach may be more vulnerable to irregular heart rates or respiration patterns. c) Simulations of stability of fitted T2 values for both methods against heart rate variation. For an input T2 of 45 ms, both the alternating acquisition (solid line) and the sequential acquisition (dashed line) result in a T2 variation of ~3 ms over the range of physiological heart rates.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4042471&req=5

Figure 1: a) Schematic of the alternating acquisition pattern. The T2Prep duration is alternated between 60, 30 and 0 (no T2Prep) ms from heartbeat to heartbeat. All images are acquired in an interleaved fashion and on average experience similar motion. b) Schematic of the conventional sequential acquisition pattern. The T2Prep duration is changed only after acquisition of an image. This approach may be more vulnerable to irregular heart rates or respiration patterns. c) Simulations of stability of fitted T2 values for both methods against heart rate variation. For an input T2 of 45 ms, both the alternating acquisition (solid line) and the sequential acquisition (dashed line) result in a T2 variation of ~3 ms over the range of physiological heart rates.
Mentions: T2 mapping through variation of the T2 preparation (T2Prep) duration has been increasingly used to robustly detect and quantify cardiac edema (Giri et al., JCardiovMagnReson2009). However, if images with incremental T2Prep duration are acquired in a sequential fashion, irregular breathing patterns and heart rates may adversely affect the quality of the T2 maps due to misalignment of the source images. A logical alternative is then to acquire all images in an alternating manner (Figure 1ab), where the T2Prep duration changes cyclically from one heartbeat to the next. Combined with a radial signal readout, this may minimize the vulnerability to respiratory or RR variability. We therefore simulated, implemented and tested the utility of an alternating magnetization preparation approach to T2 mapping.

View Article: PubMed Central - HTML

No MeSH data available.