Top

La radiologia medica

Published in:

01-11-2014 | Computed Tomography

Dosimetric evaluation of a 256-slice computed tomography scanner

Authors: Anna Radice, Claudio Ielasi, Gabriele D’Andrea, Nicoletta Paruccini, Andrea Crespi

Published in: La radiologia medica | Issue 11/2014

Abstract

Purpose

This study evaluated the effectiveness of patient dose reduction tools on a 256-slice computed tomography scanner (Brilliance iCT, Philips).

Materials and methods

The performance of the Brilliance iCT scanner was described in terms of cumulative dose and dose-normalised contrast-to-noise ratio (CNRD). The efficiency of automatic tube current modulation (Z-Dom and D-Dom), shaping filters (SmartShape and IntelliBeam) and asymmetric collimator (Eclipse) was evaluated using appropriate phantoms.

Results

The scattered radiation contribution from the peripheral regions to the cumulative dose is not negligible. The CNRD is 20 % better compared to a traditional 16-slice scanner, with a dose reduction of 40 %. The application of shaping filters decreases the dose in the peripheral regions. The application of D-Dom and Z-Dom modulations reduces the current–time product (mAs) values by 23 and 18 %, respectively, but they are not yet integrated. The over-ranging effect is not negligible, despite the use of an Eclipse asymmetric collimator.

Conclusions

Brilliance iCT dose reduction tools are efficient, but should be analysed carefully and used correctly.

Compagnone G, Angelini P, Domenichelli S (2012) Radiation dose to the population of the Emilia-Romagna region from medical exposure. Radiol Med 117:312–321PubMedCrossRef

Mettler FA Jr, Wiest PW, Locken JA, Kelsey CA (2000) CT scanning: patterns of use and dose. J Radiol Prot 20(4):353–359PubMedCrossRef

NCRP (2009) Report No. 160. On increased average radiation exposure of the US population

Shrimpton PC, Jones DG, Hiller MC et al (1991) Survey on CT practice in the UK: part 2; dosimetric aspects. Chilton, Oxon, NRPB report R-249

National Research Council (2006) Health risks from exposure to low levels of ionizing radiation: BEIR VII-Phase 2. Committee to Assess Health Risks from Exposure to Low Levels of Ionizing Radiation. Washington, DC: National Academies Press

Berrington de Gonzalez A, Mahesh M, Kim K-P et al (2009) Projected cancer risk from computed tomographic scans performed in the United States in 2007. Arch Intern Med 169:2071–2077PubMedCrossRef

Smith-Bindman R, Lipson J, Marcus R et al (2009) Radiation dose associated with common computed tomography examinations and associated lifetime attributable risk of cancer. Arch Intern Med 169:2078–2086PubMedCrossRef

Philips Healthcare (2009) The Brilliance iCT and DoseWise strategies—simplification of dose management with optimized image quality. White Paper

International Standard IEC 60601-2-43 (2010) Medical Electrical equipment-Part 2-43: Particular requirements for the safety of X-ray equipment for interventional procedures. II edition

10.

IPEM, Report No. 32. Measurement of the performance characteristics of diagnostic X-ray systems used in medicine. Part III: Computed Tomography X-ray Scanners. II edition, 2003

11.

AAPM (2010) Report No. 111. Comprehensive methodology for the evaluation of radiation dose in X-ray computed tomography: report of AAPM Task Group 111: the future of CT dosimetry

12.

Rampado O, Garelli E, Ropolo R (2010) Computed tomography dose measurements with radiochromic films and a flatbed scanner. Med Phys 37:189–196PubMedCrossRef

13.

Kalender WA, Deak P, Kellermeier M et al (2009) Application and patient size-dependent optimization of X-ray spectra for CT. Med Phys 36:993–1007PubMedCrossRef

14.

AAPM (2011) Report No. 204. Size-specific dose estimates (SSDE) in paediatric and adult body ct examinations

15.

European Commission (2000) EUR 16262 EN. European Guidelines on quality criteria for computed tomography

16.

Schilham A, van der Molen AF, Prokop M, de Fong HW (2010) Overranging at multi-section CT: an underestimated source of excess radiation exposure. RadioGraphics 30:1057–1067PubMedCrossRef

17.

De Denaro M, Bregant P (2011) Dosimetric evaluation of a 320 detector row CT scanner unit. Radiol Oncol 45:64–67PubMedCentralPubMedCrossRef

18.

Perisinakis K, Seimenis I, Tzedakis A et al (2013) The effect of head size/shape, mis-centering, and bow-tie filter on peak patient tissue doses from modern brain perfusion 256-slice CT: how can we minimize the risk for deterministic effects? Med Phys 40:011911PubMedCrossRef

Title: Dosimetric evaluation of a 256-slice computed tomography scanner
Authors: Anna Radice
Claudio Ielasi
Gabriele D’Andrea
Nicoletta Paruccini
Andrea Crespi
Publication date: 01-11-2014
Publisher: Springer Milan
Published in: La radiologia medica / Issue 11/2014
Print ISSN: 0033-8362
Electronic ISSN: 1826-6983
DOI: https://doi.org/10.1007/s11547-014-0400-5

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Dosimetric evaluation of a 256-slice computed tomography scanner

Abstract

Purpose

Materials and methods

Results

Conclusions

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Materials and methods

Results

Conclusions

Please log in to get access to this content

Other articles of this Issue 11/2014

In-depth analysis of local recurrence of giant cell tumour of bone with soft tissue extension after intralesional curettage

A single-centre experience of 200 consecutive unselected patients in percutaneous EVAR

C-arm cone-beam computed tomography needle path overlay for percutaneous biopsy of pulmonary nodules

Use of “Time-Out” checklist in interventional radiology procedures as a tool to enhance patient safety

Defaecography and colonic transit time for the evaluation of female patients with obstructed defaecation

Stereotactic gamma-ray body radiation therapy for asynchronous bilateral renal cell carcinoma