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Simultaneous Acquisition of Emission and Transmission Data for Improved Thallium-201 Cardiac SPECT Imaging Using a Technetium-99m Transmission Source

Department of Biomedical Engineering and Department of Radiology, The University of North Carolina at Chapel Hill, North Carolina

Correspondence: For reprints contact: Eric C. Frey, PhD, Department of Biomedical Engineering, The University of North Carolina, 144 MacNider Hall, CB 7575, Chapel Hill, NC 27599.

ABSTRACT

Transmission computed tomography (TCT) data provides useful complementary information to single-photon emission computed tomography (SPECT) reconstructions, especially for cardiac studies. In particular, TCT data has been used to correct for nonuniform attenuation in the chest. Typically the transmission data are acquired in a separate acquisition, but simultaneous acquisition is preferable both to save time and to avoid difficulties involved with registration. In this work, we present a technique for simultaneously acquiring ²⁰¹Tl SPECT and TCT data using a ^99mTc sheet source that requires only minor equipment modifications. The use of these isotopes results in cross-contamination of the emission and transmission data. We present a practical technique to compensate for this contamination using postacquisition image processing. This technique was evaluated by performing phantom and patient studies. The resulting images compare well with data obtained from separate emission and transmission studies.

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