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Breath‐hold MR measurements of blood flow velocity in internal mammary arteries and coronary artery bypass grafts
Author(s) -
Sakuma Hajime,
Globits Sebastian,
O'sullivan Margaret,
Shimakawa Ann,
Bernstein Matt A.,
Foo Thomas K. F.,
Amidon Thomas M.,
Takeda Kan,
Nakagawa Tsuyoshi,
Higgins Charles B.
Publication year - 1996
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.1880060138
Subject(s) - diastole , mammary artery , medicine , blood flow , flow velocity , cardiac cycle , artery , nuclear medicine , magnetic resonance imaging , cardiology , radiology , blood pressure , relaxation (psychology)
Abstract Breath‐hold velocity‐encoded cine MR (VENC‐MR) imaging is a feasible method for measuring phasic blood flow velocity in small vessels that move during respiration. The purposes of the current study are to compare breathhold VENC‐MR measurements of flow velocities in the internal mammary arteries (IMA) with nonbreath‐hold measurements and to characterize the systolic and diastolic flow velocity curves in a cardiac cycle in native IMA and IMA grafts. Flow velocity in 30 native IMA and 8 IMA grafts were evaluated with a breath‐hold VENC‐MR sequence with K‐space segmentation and view‐sharing reconstruction(TR/TE=16/9 msec, VENC=100 cm/s). In 10 native IMA, nonbreathhold VENC‐MR images were acquired as well for comparison. Breath‐hold VENC‐MR imaging showed significantly higher systolic and diastolic peak velocities in native IMA (43.1 cm/second ± 15.0 and 10.0 cm/second ± 4.8), in comparison to those of nonbreath‐hold VENC‐MR imaging (27.6 cm/second ± 10.2 and 7.3 cm/second ± 3.9, P <.05). The diastolic/systolic peak velocity ratio in the IMA grafts (.88 ± .41) was significantly higher than that in native IMA (.24 ± .08, P <.01). Interobserver variability in the flow velocity measurement was less than 4%. Breath‐hold VENC‐MR imaging demonstrated higher peak flow velocity in the IMA than nonbreath‐hold VENC‐MR imaging. This technique is a rapid and effective method for the noninvasive assessment of blood flow velocity in IMA grafts.