NDLI: Evaluation and comparison of water-equivalent CTDI dosimetry phantoms

Content Provider	IEEE Xplore Digital Library
Author	Erb, J. Schmidt, M. Schmidt, B. Kalender, W.A.
Copyright Year	2000
Description	Author affiliation: Inst. of Med. Phys., Erlangen-Nurnberg Univ., Germany (Erb, J.)
Abstract	The determination of radiation dose characteristics of CT scanners in clinical use is becoming increasingly important for patient protection and optimization of dose reduction measures. This paper focuses on the evaluation and the use of recently developed water-equivalent cylindrical head and body CTDI phantoms. CT doses measured in the new phantoms are compared with measurements in standard polymethylmethacrylate (PMMA) phantoms. The CTDI phantoms used for this study were manufactured by QRRI, Germany, and are based on a polyurethane resin technology with additives to fine-tune Hounsfield Units (HU), effective atomic number Z/sub eff/ and physical density p to those of water. A pencil ionization chamber with an active length of 10 cm was used for all measurements at our clinical CT scanner Siemens Somatom PLUS 4. All CTDI values assessed in PMMA CTDI phantoms are significantly higher (measured centrally up to 15.4%) than in the water-equivalent CTDI phantoms at all tube voltages (80 kVp, 120 kVp and 140 kVp) investigated. This is surprising, as the attenuation (/spl mu///spl rho/)*/spl rho/ of PMMA is higher than the attenuation of water or the water-equivalent polyurethane resin. This is due to a higher ratio of scattered radiation in the PMMA phantom as the authors verified by Monte Carlo simulations. In practice, using PMMA phantoms for CT dosimetry is leading to an overestimation of patient dose. This may be even more relevant in a time when diagnostic reference dose levels are implemented in clinical routine.
Starting Page	102
Ending Page	105
File Size	278455
Page Count	4
File Format	PDF
ISBN	0780364651
ISSN	1094687X
DOI	10.1109/IEMBS.2000.900679
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-07-23
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Dosimetry Imaging phantoms Computed tomography Resins Attenuation Protection Measurement standards Manufacturing Atomic measurements Ionization chambers
Content Type	Text
Resource Type	Article

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