computed tomography

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computed tomography

[kəm′pyüd·əd tə′mä·grə·fē]
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CT scans generate millions to trillions of data points, even on non-geometric surfaces, relatively quickly.
And even when CT scans or other radiology tests are necessary, doctors and technicians don't always take steps to limit radiation exposure.
Talking to reporter, he said, CT scan machine, which was out of order has been replaced with a new machine costing Rs 55 million.
10, 2014 /PRNewswire-USNewswire/ -- Using portable ultrasound as a first-line imaging study in kids with suspected appendicitis helps reduce emergency room length of stay and reduces the need for CT scans, according to a team of Mount Sinai researchers.
Because the cancer excess was still continuing at the end of follow-up, the eventual lifetime risk from CT scans cannot yet be determined.
The study included patients without previous cancer diagnoses who were first examined with CT scans in National Health Service (NHS) centers in England, Wales, or Scotland (Great Britain) between 1985 and 2002, when they were younger than 22 years of age.
A chest CT exposes patients to more than 400 times the radiation dose of a regular chest X-ray Over the last 15 years, radiation exposure has skyrocketed, not because of radiation treatment, but because of the use of CT scans for diagnosis.
Up to a half of CT scans are done unnecessarily, writes the commentator.
Now scientists in Newcastle have studied data on around 180,000 patients under the age of 22 who had CT scans at UK hospitals between 1985 and 2002.
According to the first large-scale study, children having multiple CT scans are also at greater risk of leukaemia.
However it is important that CT scans are only used when justified.
Although the relationship of exposure to ionizing radiation and cancer has been studied extensively, the current concern is fueled by a rapid rise in the number of CT scans being performed.