title: The effect of a combined tube current modulation system on dose delivered to patients undergoing thoracic and abdominal CT with a 128-slice scanner.
abstract: Combined tube current modulation techniques (such as Care Dose4D used in this study) during computed tomography (CT) procedures bring together the benefits of the angular and z-axis modulation techniques, measuring X-ray attenuation profile in the z-axis together with the data from the perpendicular x-y direction with a sophisticated algorithm. The purpose of this study was to investigate the radiation dose, in terms of computed tomography dose index (CTDI(vol)), delivered to patients during thoracic and abdominal CT using this technique and compare it with the corresponding CTDI(vol) of the fixed tube current CT technique. The results revealed a 5-32% dose reduction for chest CT and a dose reduction of 7.6-60% for the three-sequence abdominal CT scan of normal and overweight patients. In the case of obese patients a 15.4-18.7% dose increase for chest CT and a (-1.5) - (26.3)% dose increase for the three-stage abdominal examinations for females and males, respectively, was revealed.
authors.affiliation: Department of Medical Physics, School of Medicine, University of Patras, Patras 26500, Greece. skottou@med.uoa.gr
authors.forename: A
authors.initials: A
authors.lastname: Stratis
authors.forename: S
authors.initials: S
authors.lastname: Kottou
authors.forename: M
authors.initials: M
authors.lastname: Molfetas
authors.forename: I
authors.initials: I
authors.lastname: Xirafi
authors.forename: H
authors.initials: H
authors.lastname: Delis
authors.forename: G
authors.initials: G
authors.lastname: Panayiotakis
mesh_terms: D000368:Aged; D000465:Algorithms; D015992:Body Mass Index; D003287:Contrast Media / Q000494:pharmacology; D004867:Equipment Design; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D011857:Radiographic Image Interpretation, Computer-Assisted; D011860:Radiography, Abdominal / Q000379:methods*; D013902:Radiography, Thoracic / Q000379:methods*; D011874:Radiometry / Q000379:methods; D015898:Tomography Scanners, X-Ray Computed; D014057:Tomography, X-Ray Computed / Q000295:instrumentation* / Q000379:methods
chemical_list: D003287:Contrast Media