Effective dose evaluation of multidetector CT examinations: influence of the ICRP recommendation in 2007

Matsubara, Kosuke; Koshida, Kichiro; Suzuki, Masayuki; Shimono, Tetsunori; Yamamoto, Tomoko; Matsui, Osamu

doi:10.1007/s00330-009-1497-0

Cited by 22 publications

(10 citation statements)

References 13 publications

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“…When using the new ICRP 103 weighting factors the effective doses at CCTA were significantly higher than when using the outdated ICRP 60 weighting factors (29.9 mSv compared to 24.2 mSv, p<0.0001). This is in accordance with previously published data (73,74). The large difference in calculated dose between the two protocols is probably due to the great increase in tissue weighting for breast, from 0.05 to 0.12, when updating the ICRP 60.…”

Section: Commentssupporting

confidence: 92%

Computed Tomography of the Coronary Arteries

et al. 2007

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Section: Commentssupporting

confidence: 92%

Computed Tomography of the Coronary Arteries

et al. 2007

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“…Achenbach et al (13) also reported that prospective ECG‐triggered high‐pitch spiral (HPS) CTCA provided excellent image quality at a consistent dose below 1.0 mSv in nonobese patients with low and stable heart rates. Although the effective dose is regarded as the best available dose descriptor for quantifying stochastic risks in diagnostic radiology, one previous study demonstrated that effective doses were comparatively lower than doses absorbed by certain pericardial tissues on CTCA, and that it was preferable to indicate measurable organ‐absorbed doses at the same time (14) . In addition, evaluation of the physical image qualities, such as the noise power spectrum (NPS), 15 , 16 modulation transfer function (MTF), 17 , 18 slice sensitivity profile (SSP), 19 , 20 and the number of artifacts, is also important to confirm the effectiveness of HPS, SAS, and LPS modes.…”

Section: Introductionmentioning

confidence: 99%

Radiation dose and physical image quality in 128‐section dual‐source computed tomographic coronary angiography: a phantom study

Matsubara¹,

Koshida²,

Sakuta³

et al. 2012

J Applied Clin Med Phys

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One‐hundred‐and‐twenty‐eight–section dual X‐ray source computed tomography (CT) systems have been introduced into clinical practice and have been shown to increase temporal resolution. Higher temporal resolution allows low‐dose spiral mode at a high pitch factor during CT coronary angiography. We evaluated radiation dose and physical image qualities in CT coronary angiography by applying high‐pitch spiral, step‐and‐shoot, and low‐pitch spiral modes to determine the optimal acquisition mode for clinical situations. An anthropomorphic phantom, small dosimeters, a calibration phantom, and a microdisc phantom were used to evaluate the radiation doses absorbed by thoracic organs, noise power spectrums, in‐plane and z‐axis modulation transfer functions, slice sensitivity profiles, and number of artifacts for the three acquisition modes. The high‐pitch spiral mode had the advantage of a small absorbed radiation dose, but provided low image quality. The low‐pitch spiral mode resulted in a high absorbed radiation dose of approximately 200 mGy for the heart. Although the absorbed radiation dose was lower in the step‐and‐shoot mode than in the low‐pitch spiral mode, the noise power spectrum was inferior. The quality of the in‐plane modulation transfer function differed, depending on spatial frequency. Therefore, the step‐and‐shoot mode should be applied initially because of its low absorbed radiation dose and superior image quality.PACS numbers: 87.57.‐s; 87.57.C‐; 87.57.cf; 87.57.cm; 87.57.cp; 87.57.Q‐; 87.57.qp; 87.57.uq

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“…Effect of dose reduction strategies on radiation exposure. 15 the methodology portion of investigations on radiation dose also tend to not describe which portions of the ctca examination are included in their calculations, whether it be limited to the angiography portion or all the entire dose applied to the subject. The horizontal aspect represents time, the longer the CT beam is active, the more radiation exposure.…”

Section: Discussionmentioning

confidence: 99%

A Quality Improvement Project for Reducing Cardiac Computed Tomography Radiation Dose in a Community-Based, Multihospital Setting

Winchester

Chauffe²,

Liu³

et al. 2013

Critical Pathways in Cardiology: A Journal of Evidence-Based Medicine

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Radiation associated with computed tomography coronary angiography (CTCA) is a persistent concern. Strategies for reducing radiation exposure have been described, primarily in academic settings. We developed a standard protocol for CTCA acquisition focused on radiation reduction strategies in a community-based, multihospital setting and hypothesized that the protocol would be effective at reducing radiation in this setting. The protocol included the use of body mass index based tube voltage adjustment and routine use of prospective electrocardiographic gating with either dose modulation or step-and-shoot acquisition. Data on radiation exposure were collected retrospectively and compared by nonparametric testing. Some hospitals failed to routinely record radiation exposure data; only 2 facilities had data available from both before and after the intervention for direct comparison. Data were acquired from 124 subjects, 41 from the standard of care group and 83 scanned under the new protocol. In hospital A, radiation was significantly reduced by 61% from 20.5 ± 4.6 millisieverts (mSv) to 7.9 ± 4.8 mSv (P < 0.001). Within the new protocol group for hospital A, radiation was lower with step-and-shoot (4.0 ± 1.5 mSv) as compared to dose modulation (10.2 ± 4.2 mSv, P < 0.001). In hospital B, which already employed step-and-shoot acquisition, radiation dose was reduced 16% from 9.3 ± 3.0 mSv to 7.9 ± 2.2 mSv (P < 0.017) by applying body mass index-based tube voltage adjustment alone. In conclusion, a minimal investment in institutional resources can result in a reduction in radiation exposure from CTCA, even in a community-based, multihospital setting. Some facilities do not routinely record radiation exposure data.

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Effective dose evaluation of multidetector CT examinations: influence of the ICRP recommendation in 2007

Cited by 22 publications

References 13 publications

Computed Tomography of the Coronary Arteries

Computed Tomography of the Coronary Arteries

Radiation dose and physical image quality in 128‐section dual‐source computed tomographic coronary angiography: a phantom study

A Quality Improvement Project for Reducing Cardiac Computed Tomography Radiation Dose in a Community-Based, Multihospital Setting

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