By Raman, Subha
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Extra resources for Cardiovascular Multidetector CT Angiography
Both motion artifacts will appear as streaks or “stair steps” that result from data inconsistencies not recognized by the reconstruction algorithm. , end-diastole) can help minimize cardiac motion– induced artifacts. 1 Marked artifact due to motion appears as a horizontal line at the location of the gantry when motion occurred. 2 (A ) A horizontal line in the coronal reformatted plane that represents a premature atrial beat that occurred during the acquisition. (B ) A horizontal line in the sagittal reformatted plane that represents a premature atrial beat that occurred during the acquisition.
Role of CTA: The advantage of CTA in this case in comparison to traditional catheter-based angiography is the ability to delineate the anastomosis of the grafts to the native coronaries with tissue and lumen detail without multiple catheter manipulations and contrast injections to identify occluded grafts. Lacking a target for repeat revascularization in the setting of fixed perfusion abnormalities, this patient was managed medically without requiring invasive angiography. 28 Patent LIMA conduit to the left anterior descending coronary artery.
Note the presence of surgical clips (*) but no contrast-filled lumen, indicating graft occlusion of the sequence limb. Abbreviation: SVG, saphenous vein graft. CLINICAL CASE 10 A 59 year-old male with CAD and prior bypass surgery presented for evaluation of syncope. CTA showed patent free radial graft to an OM branch of the circumflex coronary artery; however, the LIMA was not visualized, suggestive of occlusion (Fig. 31). Cardiac catheterization confirmed occlusion of the LIMA. Knowing the right internal mammary artery (RIMA) was patent (Fig.
Cardiovascular Multidetector CT Angiography by Raman, Subha