The purpose of the study is to evaluate the investigational Edge-on Silicon Photon Counting CT device in a clinical setting.

Images from prior standard of care diagnostic CT exams for these subjects will also be collected. Data collected in this study will be used for technology development, scientific evaluation, marketing and education, and regulatory submissions for future products. This is a pre-market, prospective, open-label, non-randomized, single arm data collection clinical study conducted at one site in Sweden.

Inclusion Criteria:

1. 25 years of age or older;
2. Able to sign and date the informed consent form; AND
3. Have undergone a clinically indicated CT exam of the head, neck, chest, abdomen, pelvis, or extremities where images are available within 90 days of investigational scanning.

Exclusion Criteria:

1. Pregnant or lactating;
2. Previously enrolled in this study;
3. For contrast-enhanced CT exams, anyone with known or suspected allergy to iodinated contrast agents;
4. For contrast-enhanced CT exams, anyone with known or suspected renal insufficiency as determined by site medical personnel;
5. Need urgent or emergent care;
6. 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
7. Are unwilling to have GEHC personnel present for the CT exam.

The subject population will consist of adults that are 25-years of age or older, and who have undergone prior clinically indicated CT examinations within the past 90 days of at least one of the following anatomical area(s): head, neck, heart, chest, abdomen, pelvis, and extremities. Images from prior standard of care diagnostic CT examinations of these subjects will also be collected.