Gated Transmission CT Images--First Time Ever!!!
The above images are reconstructions of gated transmission computed tomography
(TCT) data taken from a human volunteer. Three slice orientations are displayed
(left=transaxial, middle=sagittal, right=coronal). For each slice orientation,
the images loop over the 16 frames of the cardiac cycle. The data were
acquired using the TCT system described in Gilland et al., J Nucl Med,
vol. 39, pp. 1105-1110. The acquisition time was approximately 15 minutes,
and the images were reconstructed using the ordered subsets-EM algorithm
with 10 iterations. The motion of the left ventricular wall is clearly
depicted; frame 1 is at end-diastole and frame 5 is at end-systole. These
images are clinically useful because (1) heart wall motion is an important
diagnostic indicator, and (2) the attenuation information provided by the
images allows accurate attenuation correction of the SPECT images.