Bush__The_Essential_Physics_for_Medical_Imaging - Biomedical ...

FIGURE 1-5. Anterior and posterior whole-body bonescan of a 74-year-old woman with a history of rightbreast cancer. This patient was injected with 925 MBq(25 mCi) of technetium (Tc) 99m methylenediphosphonate(MDP) and was imaged 3 hours later with a dualheadedwhole-body scintillation camera. The scandemonstrates multiple areas of osteoblastic metastasesin the axial and proximal skeleton. Incidental findingsinclude an arthritis pattern in the shoulders and leftknee. Computer processed planar imaging is still thestandard for many nuclear medicine examinations (e.g.,whole-body bone scans, hepatobiliary, thyroid, renal,and pulmonary studies). Planar nuclear imaging is discussedin detail in Chapter 21. (Image courtesy of Dr.David Shelton, University of California, Davis MedicalCenter, Davis, CA.)FIGURE 1-6. A myocardial perfusion stress test utilizingthallium 201 (TI 201) and single photon emission computedtomography (SPECT)imaging was performed on a79-year-old woman with chest pain. This patient hadpharmacologic stress with dipyridamole and wasinjected with 111 MBq (3 mCi) of TI 201 at peak stress.Stress imaging followed immediately on a variableangletwo-headed SPECT camera. Image data wasacquired over 180 degrees at 30 seconds per stop. Therest/redistribution was done 3 hours later with a 37-MBq(1-mCi) booster injection of TI 201. Short axis, horizontallong axis, and vertical long axis views show relativelyreduced perfusion on anterolateral wall stress images,with complete reversibility on rest/redistributionimages. Findings indicated coronary stenosis in the leftanterior descending (LAD) coronary artery distribution.SPECTis now the standard for a number of nuclear medicineexaminations including cardiac perfusion and brainand tumor imaging. SPECTimaging is discussed in detailin Chapter 22. (Image courtesy of Dr. David Shelton, Universityof California, Davis Medical Center, Davis, CA.)