Medical imaging
Because CT and MRI are sensitive to different tissue properties, the appearances of the images obtained with the two techniques differ markedly. In CT, X-rays must be blocked by some form of dense tissue to create an image, so the image quality when looking at soft tissues will be poor. In MRI, while any nucleus with a net nuclear spin can be used, the proton of the hydrogen atom remains the most widely used, especially in the clinical setting, because it is so ubiquitous and returns a large signal. This nucleus, present in water molecules, allows the excellent soft-tissue contrast achievable with MRI.
Podiatry
All podiatrists may refer patients for Medicare rebatable plain x-rays of the foot, leg, knee and femur, as well as ultrasound examination of soft tissue conditions of the foot. Podiatrists may refer patients for other radiology investigations such as CT, MRI or bone scans, however Medicare rebates do not currently exist for these examinations. Similarly, podiatrists may refer patients when needed to specialist medical practitioners, or for pathology testing, however similar exclusions in the Medicare Benefits Schedule prevent rebates being available to patients for these referrals.