The full exam, which should take no more than an hour, can be done in an outpatient clinic or hospital setting. To prepare for CT scans, patients usually have to remove their clothes, any metal objects and jewelry, then put on a hospital gown. Depending on which part of the body is being scanned, some patients need to fast for a few hours and have contrast liquid ingested or injected to emphasize more intricate structures like blood vessels. Some patients are also required to modify their diets and take laxatives. Small children may need to take a sedative so that they can remain calm and still to achieve the best test results and clearest images.
During the CT scan, the patient will lie on a table inside a doughnut-shaped machine, while an x-ray tube rotates around the body. Whirring and clicking sounds are heard while the x-ray sends small doses of radiation through the body, which are absorbed differently by different tissues. The radiation is then converted into electrical signals and sent to a computer monitor. There will be radiologists in the room with the patient the entire time and they can communicate with the patient via intercom. Once the exam is finished, individuals can resume their normal routine. They’ll be advised to drink lots of fluid to flush the contrast material from the body.
Not everyone is a fan of the CT scan, however. Professor Graham Simpson, the director of thoracic medicine at Cairns Base Hospital argues that “There is evidence that the investigation is inappropriately used, causing unnecessary expense and risking adverse events.” He admits that CT scanning has “revolutionized medical imaging,” making it possible for PET and MRI scan technology to flourish; however, it’s also ten times’ more expensive than a chest x-ray. He argues that 65% of Australians have been unnecessarily exposed to increased radiation, which causes cancer. He argues that chest CT scans should not replace a basic chest x-ray just to make a quick buck at the expense of some poor, unsuspecting patient.
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