Clinical Feasibility and Evaluation of Silicon Photon Counting CT

Inclusion Criteria:

* Who are 18 years of age or older
* Able to sign and date the informed consent form
* Who have in the past 120 days or will in the future 30 days undergo a clinically-indicated CT exam of the head, neck, heart, chest, abdomen, pelvis, or extremities where images are available for this prior scheduled exam

Exclusion Criteria:

* Who are pregnant or lactating;
* Who were previously enrolled in this study;
* For contrast-enhanced CT exams, anyone with known or suspected allergy to iodinated contrast agents
* For contrast-enhanced CT exams, anyone with known or suspected renal insufficiency as determined by site medical personnel;
* Who need urgent or emergent care;
* Who have any conditions that, in the opinion of the PI or designee, would interfere with the evaluation of the results or constitute a health hazard for the subject; OR
* Who are unwilling to have GEHC personnel present for the CT exam.