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The AAPM/RSNA Physics Tutorial for Residents ¹

Typical Patient Radiation Doses in Diagnostic Radiology

¹ From the Department of Radiology, Baylor College of Medicine, One Baylor Pl, Houston, TX 77030. From the AAPM/RSNA Physics Tutorial at the 1998 RSNA scientific assembly. Received March 31, 1999; revisions requested May 13 and received June 16; accepted June 29. Address reprint requests to R.A.P.

View larger version (12K): [in a new window]   Figures 1, 2.   (1) Schematic illustrates the profile of radiation dose delivered during a single CT scan. The CTDI equals the shaded area under the curve divided by the section thickness (T). (2) Schematic illustrates the profile of radiation dose delivered during multiple CT scans. T represents section thickness, and I represents the interval between sections. The MSAD includes the contributions of neighboring sections to the dose of the section of interest.

View larger version (21K): [in a new window]   Figures 1, 2.   (1) Schematic illustrates the profile of radiation dose delivered during a single CT scan. The CTDI equals the shaded area under the curve divided by the section thickness (T). (2) Schematic illustrates the profile of radiation dose delivered during multiple CT scans. T represents section thickness, and I represents the interval between sections. The MSAD includes the contributions of neighboring sections to the dose of the section of interest.

View larger version (18K): [in a new window]   Figure 3.   Schematic illustrates spiral CT pitch. T represents section thickness, and d represents the distance the patient couch travels during one 360° rotation of the gantry.