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Adrenal Scintigraphy: Comparison of the Anger Tomographic Scanner and the Large-Field Gamma Camera: Concise Communication

Mayo Clinic and Mayo Foundation, Rochester, Minnesota

Correspondence: For reprints contact: Manuel L. Brown, MD, Mayo Clinic and Mayo Foundation, Rochester, MN 55901.

ABSTRACT

To evaluate observer performance in adrenal scintigraphy with two different imaging instruments and to assess the requirement for computer processing in routine adrenal imaging, gamma-camera images (analog and computer processed) and Anger tomoscanner studies were independently interpreted by three observers. Thirty-eight pairs of images were used for the analysis of the receiver operating characteristic (ROC) curve in comparing the tomoscanner with the large-field gamma camera, and 44 pairs of images were used for the comparison of the gamma camera analog images with computer-processed images. ROC analysis demonstrated a higher detection rate for the tomographic images. The computer-processed images did not improve adrenal detection. When each case was considered individually, the tomoscanner was preferred in 37% of cases, and in 50% of cases, both instruments were considered to be equally valuable.