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Patient safety highlights American Association of Physicists in Medicine
Date:7/15/2010

by M Rehani will be at 8:30 a.m. on Thursday, July 22, 2010 in Room 202 of the Pennsylvania Convention Center.

ABSTRACT: http://www.aapm.org/meetings/amos2/pdf/49-14438-62523-620.pdf


6) From "Step and Shoot" to a Smooth Spiral -- Evolving CT Dose Assessment

PHILADELPHIA, PA (July 20, 2010) -- CT scanning has undergone radical changes during its thirty-plus years in clinical use, but the way radiation dosage associated with scanning is assessed has not kept pace. That may change shortly, according to Dianna Cody, Ph.D., a professor of imaging physics at the University of Texas, M.D. Anderson Cancer Center in Houston.

"Current methods are not optimal," notes Cody, who said the methods used to calculate patient exposure are based on original CT (computed tomography) machines, which required that the object of analysis travel through the instrument's field in small increments. After each small movement, the machine took a reading what investigators termed a "step and shoot" approach. These snapshots were then compiled to obtain the complete exam. Manufacturers have made great strides, however, and currently take continuous readings, collecting data in a spiral mode.

But determination of radiation exposure is still arrived at by assuming the patient is exposed in a planar mode and making mathematical adjustments to the calculation. Since CT is used for many types of medical diagnosis, and some patients being treated for conditions as diverse as cancer and kidney stones receive repeated exposure to the technique, a more straightforward and accurate means is desired by those in the field. This more direct method to assess radiation dose was developed by Robert Dixon, Ph.D., a professor at Wake Forest University in Winston Salem, North Carolina; it is becoming accepted as the CT dose assessment choice for the future.

Today at the 52n
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Contact: Jason Bardi
jbardi@gmail.com
301-209-3091
American Institute of Physics
Source:Eurekalert

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