H Greess1, H Wolf, U Baum, W A Kalender, W Bautz. 1. Institut für Diagnostische Radiologie, Friedrich-Alexander-Universität Erlangen-Nürnberg. holger.greess@idr.med.uni-erlangen.de
Abstract
PURPOSE: To examine the feasibility of reducing exposition in CT examinations by applying a prototype device for tube current modulation with the image quality remaining unchanged. PATIENTS AND METHODS: The prototype device for tube current modulation was integrated into a Somatom Plus 4 CT scanner (Siemens). The method is based on anatomy-oriented modulation of the tube current. The attenuation of the X-ray beam by the patient's body was determined online, the tube current was adapted to changing anatomy after a delay of 180 degrees. In ten patients undergoing radiotherapy, four identical scans of the shoulder region were carried out with and without tube current modulation. For determining dose reduction, mAs product of both scans were compared. The evaluation of noise artifacts, low contrast detectability and overall image quality was performed by four radiologists in a blinded fashion. RESULTS: Patient doses could be reduced by 38% on an average. Scans with tube current modulation were superior to scans without it as to noise (75%), low contrast detectability (51%), artifacts (69%), and overall image quality (71%). CONCLUSIONS: A significant reduction in exposition during CT can be achieved by anatomy-oriented tube current modulation without image degradation.
PURPOSE: To examine the feasibility of reducing exposition in CT examinations by applying a prototype device for tube current modulation with the image quality remaining unchanged. PATIENTS AND METHODS: The prototype device for tube current modulation was integrated into a Somatom Plus 4 CT scanner (Siemens). The method is based on anatomy-oriented modulation of the tube current. The attenuation of the X-ray beam by the patient's body was determined online, the tube current was adapted to changing anatomy after a delay of 180 degrees. In ten patients undergoing radiotherapy, four identical scans of the shoulder region were carried out with and without tube current modulation. For determining dose reduction, mAs product of both scans were compared. The evaluation of noise artifacts, low contrast detectability and overall image quality was performed by four radiologists in a blinded fashion. RESULTS:Patient doses could be reduced by 38% on an average. Scans with tube current modulation were superior to scans without it as to noise (75%), low contrast detectability (51%), artifacts (69%), and overall image quality (71%). CONCLUSIONS: A significant reduction in exposition during CT can be achieved by anatomy-oriented tube current modulation without image degradation.
Authors: Cristian T Badea; Arthur W Wetzel; Nilesh Mistry; Stuart Pomerantz; Demian Nave; G Allan Johnson Journal: Comput Med Imaging Graph Date: 2008-04 Impact factor: 4.790
Authors: Andreas Christe; Johannes Heverhagen; Christoph Ozdoba; Christian Weisstanner; Stefan Ulzheimer; Lukas Ebner Journal: World J Radiol Date: 2013-11-28
Authors: Ulrich Baum; Katharina Anders; Gregor Steinbichler; Michael Lell; Holger Greess; Thomas Riedel; Marc Kachelriess; Willi A Kalender; Werner A Bautz Journal: Eur Radiol Date: 2004-08-24 Impact factor: 5.315
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