Image filters aid CT diagnosis

Adaptive image filters can lower the patient radiation associated with chest and abdominal computed tomography scans while significantly improving image quality, according to a recent study.

Adaptive image filters can lower the patient radiation associated with chest and abdominal computed tomography (CT) scans while significantly improving image quality, according to a study to be presented at the American Roentgen Ray Society - ARRS 2010 Annual Meeting in San Diego, CA.

Image filters are one of the tools used in image processing to lower image noise in low radiation dose CT. “As we lower the radiation dose, the CT images become noisy or speckled which makes it difficult to view the organs or the body structures in the image,” said Sarabjeet Singh, MD, lead author of the study.

“Image filters allow us to effectively lower the radiation dose without sacrificing the image clarity,” said Singh. The study, performed at Massachusetts General Hospital in Boston, MA, included 12 patients who received a CT scan at four different levels of radiation dose in the chest and abdomen. All low dose images were processed with adaptive filters, and “regardless of radiation dose, post processing with image filters improved subjective noise for both chest and abdominal CT and helped lower the CT radiation dose levels for chest by up to 40 mAs and for the abdominal CT by up to 100 mAs,” said Singh.

Posted by Conard Holton
Vision Systems Design

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