A new report summarized methods for radiation dose optimization in chest computed tomography (CT) imaging scans. Chest CT is the third most typically performed CT examination, frequently used to diagnose the cause of clinical signs or symptoms of the chest, such as cough, shortness of breath, fever, or chest pain.

Regardless of the body area being scanned, dose reduction must always begin by making sure that there is a valid clinical indication for CT scanning. “Use of the appropriate radiation dose for chest CT is especially important because of direct radiation exposure of breasts, lungs and other organs, such as the thyroid, which represent some of the most radiosensitive organs in the human body,” said Mahadevappa Mahesh, MS, PhD, author of the article, published September 2011 issue of the Journal of the American College of Radiology.

Investigators from Massachusetts General Hospital (Boston, MA, USA) , Harvard Medical School (Boston, MA, USA), and Johns Hopkins University (Baltimore, MD, USA) reviewed practical strategies for reducing radiation dose associated with chest CT scans. “Radiation dose reduction for chest CT requires tweaking of scanning protocols and techniques on the basis of patient age, size, clinical indications, and follow-up imaging,” said Dr. Mahesh.

Other specific strategies for dose reduction on chest CT involve the stratification of CT protocols on the basis of clinical indications, which determines the required image quality for evaluating specific abnormalities in question. “Pediatric chest CT should always be performed at lower radiation doses compared with chest CT in adult patients,” said Dr. Mahesh.

Investigators also emphasized that limiting scan length using appropriate scan parameters such as lower tube current, automatic exposure control, and lowering tube voltage for thin patients, are key to reducing radiation dose for chest CT examinations in children and adults.

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