Open AccessAn evaluation of organ dose modulation on a GE optima CT660‐computed tomography scanner
Author(s) -
Dixon Matthew T.,
Loader Robert J.,
Stevens Gregory C.,
Rowles Nick P.
Publication year - 2016
Publication title -
journal of applied clinical medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.83
H-Index - 48
ISSN - 1526-9914
DOI - 10.1120/jacmp.v17i3.5724
Subject(s) - scanner , computed tomography , nuclear medicine , tomography , medical physics , medicine , radiology , optics , physics
Organ Dose Modulation or ODM (GE Healthcare, Milwaukee, WI) was evaluated to characterize changes inCTDI vol , image noise, effective dose, and organ dose saving to patients. Three separate investigations were completed: a tube current modulation phantom was scanned with and without ODM, aCTDI volphantom was scanned with ODM, and Monte Carlo simulations were performed. ODM was found to reduce theCTDI volby approximately 20% whilst increasing the noise by approximately 14%. This was reflected in the dose distribution, where the anterior peripheral dose was reduced by approximately 40% whilst the identical posterior dose remained largely unaffected. Enabling ODM for the entire scan would reduce the effective dose by approximately 24%; however, this saving reduces to 5% if the images are matched forCTDI vol . These savings mostly originated from reductions in dose to the stomach, breasts, colon, bladder, and liver. ODM has the effect of a global reduction inCTDI volwith an associated increase in image noise. The benefit of ODM was found to be reduced when the dose‐saving contribution from the reducedCTDI volwas removed. Given that there is a higher contribution to effective dose throughout the body from the anterior projections, consideration should be given to applying ODM throughout. PACS number(s): 87.10.Rt, 87.53.Bn, 87.57.C‐, 87.57.Q‐