Single Photon Emission Computed Tomography and Albumin Colloid Imaging of the Liver
A single photon emission computed tomography (ECT) system using the GE 400T Anger camera with 37 PM tubes and the SPETS software has been installed in our clinical laboratory. It has been used in the study of liver imaging with Tc-99m albumin colloid and other agents.
The object of the study is to define what improvement in liver diagnosis might be made using ECT. The new information ECT gives access to is cine of the rotating liver and transverse, coronal, and sagittal sections of the liver. The significant problems in ECT imaging are statistics and resolution, scattering, patient movement, gamma ray attenuation, and artifacts introduced in the data acquisition and processing.
Patients were injected with 3–4 mCi (ca 120 MBq) of colloid; five standard liver-spleen views and a 64-image ECT study were acquired. The ECT images were acquired either in a circle of the radius of the longer transverse axis of the patient or in an ellipse to match the patient contour. Studies were corrected for the attentuation of the Tc-99m gamma rays by tissue.
A series of normal and abnormal patients have been studied and the data analyzed. The significant change in the technique of ECT imaging is the elliptical motion of the camera head which allows a better approximation of the patient contour and improves the spatial resolution of the images.
KeywordsSingle Photon Emission Compute Tomography Cavernous Hemangioma Camera Head Anger Camera Albumin Colloid
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