 Using other non-IV contrast abdominal or pelvic scans such as a Virtual Colonography studies, the QCT exam can be performed without requiring any further image acquisition or consequent radiation dose to the patient.QCT enables spine BMD measurements on patients with scoliosis, which cannot usually be measured using Dual-energy X-ray absorptiometry (DXA).In addition, QCT can avoid the artificially high BMD measurements that can confuse the results from DXA in arthritic patients, patients who are obese, who suffer from disc space narrowing or spinal degenerative diseases, aortic calcification or osteophytes.