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The LightSpeed VCT has the ability to generate images at very small spacing and thereby exceed the number of native acquisition channels. When the scanner operates in a helical mode of data acquisition with its 64×0.625 mm detector configuration and a 1.375:1 helical pitch, images can be reconstructed spacings as small as 0.1 mm. The table below shows the average number of slices that can be generated per 360 deg of gantry rotation. The average number of slices per gantry rotation is calculated by dividing the total number of reconstructed slices by the number of rotations during the data acquisition.

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Once the cardiac helical data has been collected, it can be reconstructed at one or more arbitraryheart cycle phase locations. Segmented reconstruction is also available retrospectively if nongated images are desired.Cardiac Cine acquisition for cardiac imaging is available in conjunction with SnapShot Pulse andprospective cardiac gating. In this step and shot cine scanning mode, the heart rate is monitoredduring the scan and the R-peak triggers the acquisition of data for that location. The table movesto the next location and waits for the next R-peak to trigger acquisition of data for the phasespecified. SnapShot Pulse is a lower dose mode compared to cardiac helical modes. A paddingvalue allows for flexibility of neighboring phase locations to accommodate small fluctuations inheart rate (a few BPM or less). However, a stable heart rate of 65BPM or less is recommended forSnapShot Pulse.

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Cardiac helical is a lower pitch helical scan is available for cardiac applications in conjunction withthe CardIQ SnapShot option. In this scanning mode, heart rate monitoring is performed during thehelical acquisition and the associated EKG gating information is stored with the scan data suchthat a cardiac gated SnapShot reconstruction algorithm can be applied for prospective andretrospective images. SnapShot reconstruction is used to minimize the motion of the heart in theresultant images. The pitch factor for the cardiac helical scan is determined by the system and is afunction of the patient heart rate.