I am currently using a Siemens Somatom Sensation 64-slice CT scanner to do Cardiac and other Angiographic procedures. I have been in a quandary about how to eliminate what appears to be a Z axis shift during the acquisition for CCTAâ€™s. I have been over the dissertation by Siemens that always leads the error back to technologist error or patient motion. I noticed a "banding" effect on every CCTA done with this machine. This was explained as the contrast attenuation during the acquisition. I noticed on the ctisus.com site the same artifact. When I put the entire VRT in the lateral position as an MIP, I noticed the Z axis shift through the ribs corresponds to the banding effect. Do you have any suggestions how to remedy this or have you seen this on other scanner acquisitions?
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