DUAL MODALITY IMAGING (3-D BODY SCAN, PET/CT, SPECT/CT, BIOGRAPH, DISCOVERY VH HAWKEYE, DISCOVERY VI POST RACE, DISCOVERY LS, GEMINI)
Dual–modality imaging combines different types of imaging techniques to simultaneously evaluate the functional structure and metabolic physiology. Traditional single-mode structural imaging includes ultrafast computed tomography (CT) and magnetic resonance imaging (MRI). Traditional functional imaging that evaluates the physiology occurring in tissues includes positive emission tomography (PET) and single-photon emission computed tomography (SPECT). Dual-mode imaging combines one of the structural imaging techniques with one of the functional imaging techniques, and data are acquired by one machine containing both the x-ray component and the radionuclide detector during only one procedure. After both sets of images are acquired, computer software then merges the data and fuses the images to give results that are more sensitive and specific than a single procedure alone, and that overcomes many limitations of every single procedure. Also, simultaneous imaging can provide improved attenuation correction and anatomic mapping and overcome issues with the body being positioned differently for tests taken at two separate times. In the 3-D Body Scan, cross-sectional CT images are fused with the metabolically differentiated PET images to produce a single three-dimensional image that provides better detection of early heart disease, cancer, and brain disorders than either modality alone.