Single Photon Emission Computed Tomography/Computed Tomography (SPECT/CT) Prospective Double-Scanning Study

The goal of this study is to collect image data for the StarGuide GX Single Photon Emission Computed Tomography/Computed Tomography (SPECT/CT) System in a clinical setting. The StarGuide GX scan will be compared to the participant's clinically indicated SPECT/CT scanner.

Inclusion Criteria: * Adult, who is at least 18 years of age, on day of consent. * Must have a clinically indicated SPECT/CT exam scheduled according to current clinical practice standards; AND * Able and willing to provide informed consent for participation in this study. Exclusion Criteria: * Who, per the site's Standard Operating Procedures (SOPs), has any condition that would prevent the clinically indicated SPECT/CT from proceeding (i.e., pregnancy, breastfeeding, renal impairment, etc.); * Who were previously enrolled in this study; * Who need urgent or emergent care; * Who have any conditions that, in the opinion of the Principal Investigator (PI) or designee, would interfere with the evaluation of the results, or constitute a health hazard for the participant; * Unwilling to have GE Healthcare personnel present during scans; OR * Unable to tolerate the exam.