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Dark blood cine for improved Visualization of Intracavitary Structures (iVIS)

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Therefore, structures including papillary muscles, trabeculations, and intracardiac masses are better visualized with dark blood (DB) techniques... DB imaging also provides better image contrast for low signal structures since it avoids the dynamic range compression present in bright blood imaging... We therefore developed a novel dark blood gradient echo cine sequence that simultaneously depicts morphology, motion of intracardiac structures, and cardiac contraction... A prospectively gated spoiled gradient echo cine sequence (TE 2.28 ms, TR 5.0 ms, temporal resolution 35 ms, segments 7, matrix 256 × 140, fov 340 mm, slice thickness 3 mm) was modified to play a 75 mm saturation slab 5 mm above and 5 mm below the imaging slice before every cardiac phase (temporal resolution 48.15 ms), see Figure 1... On a Siemens MAGNETOM Verio 3 Tesla clinical MRI scanner, short-axis cine images were acquired in five volunteers with the conventional spoiled gradient echo cine sequence and with the new DB cine sequence... LV cavity and myocardium signal to noise (SNR) was measured in all cardiac phases of all patients and the average values of the conventional and the new DB cine images were compared... Figure 2 shows the same cine frames acquired with the conventional (panel a) and the developed DB cine sequence (panel b)... Visual inspection revealed a strong reduction in blood signal... SNR measurements confirmed this finding... Average blood SNR was significantly reduced from 18.9 ± 4.9 to 3.4 ± 1.1 (mean ± stdev)... Myocardial SNR was statistically identical in the conventional (13.3 ± 5.1) and dark blood (12.6 ± 2.9) images (p > 0.05)... The presented DB cine technique reliably suppresses blood signal and thereby improves the depiction of intracardiac structures, masses, papillary muscles and trabeculations.

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location of imaging slice and parallel saturation slabs (left); sequence timing showing application the saturation slabs prior to segmented acquisition of each cardiac phase. Only one RR interval is shown (right).
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Figure 1: location of imaging slice and parallel saturation slabs (left); sequence timing showing application the saturation slabs prior to segmented acquisition of each cardiac phase. Only one RR interval is shown (right).

Mentions: A prospectively gated spoiled gradient echo cine sequence (TE 2.28 ms, TR 5.0 ms, temporal resolution 35 ms, segments 7, matrix 256 × 140, fov 340 mm, slice thickness 3 mm) was modified to play a 75 mm saturation slab 5 mm above and 5 mm below the imaging slice before every cardiac phase (temporal resolution 48.15 ms), see Figure 1. On a Siemens MAGNETOM Verio 3 Tesla clinical MRI scanner, short-axis cine images were acquired in five volunteers with the conventional spoiled gradient echo cine sequence and with the new DB cine sequence. LV cavity and myocardium signal to noise (SNR) was measured in all cardiac phases of all patients and the average values of the conventional and the new DB cine images were compared.


Dark blood cine for improved Visualization of Intracavitary Structures (iVIS)
location of imaging slice and parallel saturation slabs (left); sequence timing showing application the saturation slabs prior to segmented acquisition of each cardiac phase. Only one RR interval is shown (right).
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4042614&req=5

Figure 1: location of imaging slice and parallel saturation slabs (left); sequence timing showing application the saturation slabs prior to segmented acquisition of each cardiac phase. Only one RR interval is shown (right).
Mentions: A prospectively gated spoiled gradient echo cine sequence (TE 2.28 ms, TR 5.0 ms, temporal resolution 35 ms, segments 7, matrix 256 × 140, fov 340 mm, slice thickness 3 mm) was modified to play a 75 mm saturation slab 5 mm above and 5 mm below the imaging slice before every cardiac phase (temporal resolution 48.15 ms), see Figure 1. On a Siemens MAGNETOM Verio 3 Tesla clinical MRI scanner, short-axis cine images were acquired in five volunteers with the conventional spoiled gradient echo cine sequence and with the new DB cine sequence. LV cavity and myocardium signal to noise (SNR) was measured in all cardiac phases of all patients and the average values of the conventional and the new DB cine images were compared.

View Article: PubMed Central - HTML

AUTOMATICALLY GENERATED EXCERPT
Please rate it.

Therefore, structures including papillary muscles, trabeculations, and intracardiac masses are better visualized with dark blood (DB) techniques... DB imaging also provides better image contrast for low signal structures since it avoids the dynamic range compression present in bright blood imaging... We therefore developed a novel dark blood gradient echo cine sequence that simultaneously depicts morphology, motion of intracardiac structures, and cardiac contraction... A prospectively gated spoiled gradient echo cine sequence (TE 2.28 ms, TR 5.0 ms, temporal resolution 35 ms, segments 7, matrix 256 × 140, fov 340 mm, slice thickness 3 mm) was modified to play a 75 mm saturation slab 5 mm above and 5 mm below the imaging slice before every cardiac phase (temporal resolution 48.15 ms), see Figure 1... On a Siemens MAGNETOM Verio 3 Tesla clinical MRI scanner, short-axis cine images were acquired in five volunteers with the conventional spoiled gradient echo cine sequence and with the new DB cine sequence... LV cavity and myocardium signal to noise (SNR) was measured in all cardiac phases of all patients and the average values of the conventional and the new DB cine images were compared... Figure 2 shows the same cine frames acquired with the conventional (panel a) and the developed DB cine sequence (panel b)... Visual inspection revealed a strong reduction in blood signal... SNR measurements confirmed this finding... Average blood SNR was significantly reduced from 18.9 ± 4.9 to 3.4 ± 1.1 (mean ± stdev)... Myocardial SNR was statistically identical in the conventional (13.3 ± 5.1) and dark blood (12.6 ± 2.9) images (p > 0.05)... The presented DB cine technique reliably suppresses blood signal and thereby improves the depiction of intracardiac structures, masses, papillary muscles and trabeculations.

No MeSH data available.