Significant improvement using the amplitude‐sorting technique was observed, particularly when testing nonperiodic motion functions. ![]() A 180° interpolation was used for reconstruction after gating. The motion was monitored using a strain gauge inserted inside an adjustable belt. A 16‐slice CT scanner (Sensation 16, Siemens Medical Solutions, Erlangen, Germany) was used to acquire images of two phantoms on a motion platform moving in two dimensions. This method is compared to previously developed methods that sort based on phase. We present a new retrospective gating technique with sorting based on the amplitude of the motion trace. ![]() Although several groups have investigated the use of 4D‐CT in radiotherapy, little has been detailed with regard to the sorting method. Four‐dimensional CT (4D‐CT) is a method in which image reconstruction of moving objects is retrospectively gated according to the recorded phase information of the monitored motion pattern. ![]() Respiratory motion causes artifacts, which prevents adequate visualization of anatomy. Image quality of CT scans suffers when objects undergo motion.
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