This study evaluates whether images taken using a photon counting detector CT scanner (PCD-CT) can determine the growth of rectal cancer as well as, or better than, MRI for the management of patients with rectal cancer.
Inclusion Criteria:
* Adult patients 18 to 99 years of age
* Patients with proven rectal cancer clinically referred for staging pelvic MRI and contrast-enhanced CT of the abdomen and pelvis (for evaluation of liver and peritoneal disease)
* Endoscopic or imaging report that tumor is 2 cm or larger
* Patients who are able and willing to sign the informed consent
* Negative pregnancy test if subject is of child-bearing age (females of child-bearing potential will be screened for pregnancy using a urine pregnancy test, which will be administered by the unit study coordinator at no cost to the patient)
Exclusion Criteria:
* Minors less than 18 years old
* Patient unable to provide written informed consent
* Pregnancy
* Estimated Glomerular Filtration Rate (eGFR) ≤ 60
* History of prior moderate or severe contrast reaction including unresponsiveness, severe respiratory distress, convulsions, arrhythmia, cardiopulmonary distress, progressive angioedema, laryngeal edema, dyspnea, bronchospasm, symptomatic tachycardia, symptomatic bradycardia, hypotension, hypertensive crisis
* Any history of premedication prior to iodinated contrast
* Bilateral hip replacement/prosthesis
* Patients that consent to participation but do not undergo their clinically indicated MRI scanning for any reason (e.g., bad IV, infiltration, reaction, change in indication)
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