2124 Whole-Heart Magnetic Resonance Coronary Angiography (WH MRCA) with visual feedback
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BioMed Central
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Meeting abstract
2124 Whole-Heart Magnetic Resonance Coronary Angiography (WH MRCA) with visual feedback Shigehide Kuhara*1, Tomohisa Okada2, Shotaro Kanao2, Ayako Ninomiya1, Saori Sato1, Toshikazu Kamae2, Kimio Goto2 and Kaori Togashi2 Address: 1Toshiba Medical Systems Corporation, Otawara-shi, Japan and 2Department of Diagnostic Radiology, Kyoto University, Kyoto, Japan * Corresponding author
from 11th Annual SCMR Scientific Sessions Los Angeles, CA, USA. 1–3 February 2008 Published: 22 October 2008 Journal of Cardiovascular Magnetic Resonance 2008, 10(Suppl 1):A393
doi:10.1186/1532-429X-10-S1-A393
Abstracts of the 11th Annual SCMR Scientific Sessions - 2008
Meeting abstracts – A single PDF containing all abstracts in this Supplement is available here. http://www.biomedcentral.com/content/pdf/1532-429X-10-S1-info.pdfThis abstract is available from: http://jcmr-online.com/content/10/S1/A393 © 2008 Kuhara et al; licensee BioMed Central Ltd.
Introduction Currently, WH MRCA studies are usually performed during free breathing while monitoring the position of the diaphragm. However, since the scan time is rather long, the patient's breathing pattern may change during scanning, and scanning sometimes cannot be completed. In another method, WH MRCA is performed during multiple breath-holds. However, patients cannot hold their breath within a threshold each time, and it is also difficult to perform scans in a short time. These problems are attributable to the fact that patients cannot recognize their breathing level and therefore cannot adjust it.
Purpose We have developed a visual feedback (VFB) system for visually displaying the breathing level to the patient, thus permitting the patient to adjust his or her breathing level. The present study was undertaken to investigate the usefulness of the VFB system in WH MRCA studies.
Methods All studies were performed using a 1.5-T MRI scanner with a whole-body phased-array coil system and 16-channel receivers. A 3D SSFP pulse sequence was used in combination with Real-time Motion Correction (RMC), which detects the position of the diaphragm and performs correction to compensate for the effects of respiratory motion. Scanning was performed with TR/TE = 4.3/2.2, matrix size = 192 × 256, and number of segments = 4. The parallel imaging factor was 2 in the phase direction and
1.5 in the slice direction. A total of 80 slices were obtained. The spatial resolution was 0.75 × 0.75 × 0.75 mm3. An abdominal band was used, but set looser than usual for abdominal band-free scanning. In the VFB system, information concerning the breathing level is obtained by an RMC probing pulse, converted to a video signal, and projected onto a screen in front of the scanner by an LC projector. The displayed information is reflected in a mirror, allowing it to be viewed by the patient. Eleven healthy volunteers were scanned using the following three methods and the results were compared: 1) WH MRCA during free breathing (FB-VFB), 2) WH MRCA during free breath
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