Impact of organ-specific dose reduction on the image quality of head and neck CT angiography
- PDF / 266,108 Bytes
- 7 Pages / 595.276 x 790.866 pts Page_size
- 74 Downloads / 202 Views
HEAD AND NECK
Impact of organ-specific dose reduction on the image quality of head and neck CT angiography L. Schimmöller & R. S. Lanzman & P. Heusch & S. Dietrich & F. Miese & J. Aissa & T. A. Heusner & G. Antoch & P. Kröpil
Received: 11 September 2012 / Revised: 15 November 2012 / Accepted: 19 November 2012 / Published online: 9 January 2013 # European Society of Radiology 2013
Abstract Objectives Organ-specific dose reduction (OSDR) algorithms can reduce radiation on radiosensitive organs up to 59 %. This study evaluates the influence of a new OSDR algorithm on image quality of head and neck computed tomographic angiography (CTA) in clinical routine. Methods Sixty-two consecutive patients (68 ± 13 years) were randomised into two groups and imaged using 128row multidetector CT. Group A (n031) underwent conventional CTA and group B (n031) CTA with a novel OSDR algorithm. Subjective and objective image quality were statistically compared. Subjective image quality was rated on a five-point scale. Signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) were calculated with regionof-interest measurements. Results The SNR of the common carotid artery and middle cerebral artery was 53.6±22.7 and 43.3±15.3 (group A) versus 54.1±20.5 and 46.2±14.6 (group B). The CNR was 40.0± 19.3 and 29.7±12.0 (group A) compared with 40.7±16.8 and 32.9±10.9 (group B), respectively. Subjective image quality was excellent in both groups (mean score 4.4±0.7 versus 4.4± 0.6). Differences between the two groups were not significant. Conclusions The novel OSDR algorithm does not compromise image quality of head and neck CTA. Its application can be recommended for CTA in clinical routine to protect the thyroid gland and ocular lenses from unnecessary high radiation. Key Points • Organ-specific dose reduction (OSDR) can significantly reduce radiation exposure during CT
L. Schimmöller : R. S. Lanzman (*) : P. Heusch : S. Dietrich : F. Miese : J. Aissa : T. A. Heusner : G. Antoch : P. Kröpil Department of Diagnostic and Interventional Radiology, University Dusseldorf, Medical Faculty, Moorenstrasse 5, 40225 Dusseldorf, Germany e-mail: [email protected]
• OSDR does not compromise image quality of head and neck CTA • OSDR can significantly lower the risk of radiation damage to sensitive organs • OSDR can easily be applied in routine clinical practice Keywords CT angiography . Organ-specific dose reduction . Head and neck arteries . Image quality . Radiation dose Abbreviations OSDR Organ-specific dose reduction CTDIvol CT dose index DLP Dose–length product SNR Signal-to-noise ratio CNR Contrast-to-noise ratio ROI Region of interest
Introduction Radiation exposure is a main issue in X-ray and computed tomography (CT) examinations. CT examinations contribute significantly to the radiation exposure in medical imaging. CT might be responsible for more than 50 % of the collective radiation dose in western countries, even though CT examinations may only represent 7 % of all diagnostic imaging examinations using ionising radiati
Data Loading...
