Abstract Archives of the RSNA, 2008
Pragya Ahuja Dang MBBS, Presenter: Nothing to Disclose
Mannudeep Karanvir Singh Kalra MD, Abstract Co-Author: Research grant, General Electric Company
Chris L. Sistrom MD, Abstract Co-Author: Technical Consultant, Nuance Communications, Inc
Technical Consultant, Commissure, Inc
Medical Advisory Board, Nuance Communications, Inc
Thomas Schultz, Abstract Co-Author: Nothing to Disclose
Markus Stout, Abstract Co-Author: Nothing to Disclose
Keith J. Dreyer DO, PhD, Abstract Co-Author: Employee, Perceptics, LLC
Medical Advisor, Perceptics, LLC
Medical Advisor, Agfa-Gevaert Group
Medical Advisor, FUJIFILM Holdings Corporation
Medical Advisor, General Electric Company
Medical Advisor, McKesson Corporation
Medical Advisor, AuntMinnie.com
Medical Advisor, AMICAS, Inc
Medical Advisor, Dynamic Imaging, LLC
Medical Advisor, Ascom Holding AG
Medical Advisor, Bracco Group
Medical Advisor, Merge Healthcare
Medical Advisor, Emageon, Inc
Medical Advisor, RCG HealthCare Consulting
Medical Advisor, Valley Radiology Medical Associates, Inc
Medical Advisor, The Elizabeth Wende Breast Clinic
Medical Advisor, ISCI
Medical Advisor, Siemens AG
Medical Advisor, Barco nv
Medical Advisor, Hue AS
Medical Advisor, Planar Systems, Inc
Medical Advisor, Vital Images, Inc
Medical Advisor, Commissure, Inc
Medical Advisor, TeraRecon, Inc
Medical Advisor, Mercury Computer Systems, Inc
Medical Advisor, IBM Corporation
Medical Advisor, Hewlett-Packard Company
Medical Advisor, EMC Corp
Medical Advisor, Phase Forward Incorporated
Medical Advisor, Winchester Systems, Inc
Medical Advisor, Dell Inc
Medical Advisor, Eastman Kodak Company
Medical Advisor, Amirsys, Inc
Medical Advisor, Reed Elsevier
Committee member, Diagnostic Imaging
Committee member, AuntMinnie.com
Committee member, Imaging Economics
Author, Springer Science+Business Media Deutschland GmbH
Shareholder, Microsoft Corporation
Shareholder, Intel Corporation
Shareholder, IBM Corporation
Shareholder, Hewlett-Packard Company
Shareholder, Dell Inc
Shareholder, General Electric Company
Shareholder, Siemens AG
Shareholder, Google Inc
Shyla S Saini, Abstract Co-Author: Nothing to Disclose
et al, Abstract Co-Author: Nothing to Disclose
Concerns have been expressed about increasing radiation exposure from CT scans. The purpose of our study was to estimate per scan and per patient radiation doses delivered by CT scanning in a single tertiary care institution over a 10-year period.
Information from our institution’s RIS and PACS was used to create a comprehensive data warehouse. We identified all CT exams (n=634,694) performed in 198,783 patients (age range=0-104 years, M:F=102,409:96,374) from 1996-2005. For each patient, we extracted information about their age, gender, body region(s) examined and date of the study. A sample of 45 cases in each of 8 age group by body region strata (children/adults and abdomen/chest/head/neck) was isolated. For each of these exams, scan parameters (kVp, mA, rotation time, pitch, scanner type, vendor, body region, and scan length) were recorded from DICOM headers. We used Monte Carlo simulation software (Impact Dose, UK) to estimate effective doses which were normalized for pediatric age groups and created a 2x4 table of mean effective doses. These were applied back to all exams linked by age group and body area to form an analytic data set for determining effective doses for different ages and body regions scanned over the 10 years.
Overall, the cumulative effective dose per patient was 7.4±19.4 mSv for 0-18 years and 36.2±57.2 mSv for >18 years (p<0.0001). In adults, abdomen contributed to highest annual cumulative individual doses (25.4 mSv) followed by chest (21.8 mSv). In children, chest CT contributed to the highest cumulative (12.7 mSv) individual doses per year followed by abdomen (5.3 mSv). Over 10 years, effective dose per patient per year decreased from 4.16 mSv to 4.11 mSv in children (p<0.001) and increased from 13.5 mSv to 18.7 mSv in adults (p<0.0001) although the number of CT exams per patient increased in both children and adults.
Although number of CT exams performed annually has increased in all age groups, there is marked increase in dose noted for adults (3.61%) as compared to a slight decrease in the annual effective individual doses in children (0.01%). Abdomen and chest exams contribute most to the individual radiation doses attributable to CT scanning in all ages.
Audit of 10 year CT radiation dose shows an average increase of 3.7% in annual dose with an overall average individual cumulative dose of 35.4±58.4 mSv.
Dang, P,
Kalra, M,
Sistrom, C,
Schultz, T,
Stout, M,
Dreyer, K,
Saini, S,
et al, ,
CT-associated Radiation Dose Over a 10-year Period in a Single Tertiary Healthcare Center. Radiological Society of North America 2008 Scientific Assembly and Annual Meeting, February 18 - February 20, 2008 ,Chicago IL.
http://archive.rsna.org/2008/6010511.html