Absorbed radiation dose of the female breast during diagnostic multidetector chest CT and dose reduction with a tungsten–antimony composite breast shield: preliminary results

Parker, Mark S.; Kelleher, Nicole M.; Hoots, Jessica A.; Chung, Jiyearn K.; Fatouros, Panos P.; Benedict, Stanley H

doi:10.1016/j.crad.2007.07.029

Cited by 27 publications

(19 citation statements)

References 29 publications

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“…Appropriate patient preparation, including establishing a steady sinus bradycardia of less than 60 beats/min, is essential to maximize the usefulness of these strategies [27]. The reduction in breast dose achieved using bismuth breast shields in this study is consistent with the reductions achieved in previous studies, which realized breast dose savings of 40-50% for various MDCT applications including pulmonary CTA studies [11][12][13]. The discrepancy in breast shielding efficiency between different MDCT applications principally reflects the position of the x-ray tube in the gantry at the initiation of scanning.…”

Section: Discussionsupporting

confidence: 81%

“…Several studies have evaluated the effectiveness of using bismuth shields, a lower tube potential (kVp) setting, and tube current modulation in reducing breast dose during thoracic CT studies using 16-or 64-MDCT [11][12][13]. The latest generation of CT scanners utilizing larger detector arrays, up to 320-MDCT, facilitates further reduction in radiation exposure during coronary CTA compared with helical acquisitions performed with smaller detector arrays [14].…”

mentioning

confidence: 99%

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Direct Quantification of Breast Dose During Coronary CT Angiography and Evaluation of Dose Reduction Strategies

Abadi

Mehrez²,

Ursani³

et al. 2011

American Journal of Roentgenology

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Section: Discussionsupporting

confidence: 81%

mentioning

confidence: 99%

Direct Quantification of Breast Dose During Coronary CT Angiography and Evaluation of Dose Reduction Strategies

Abadi

Mehrez²,

Ursani³

et al. 2011

American Journal of Roentgenology

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“…The average effective dose in our unselected population of females (with BMI widely ranging from 15 to 48) was 2.73 mSv in th e FBP group, i.e. at the lower end of the dose ranges demonstrated in the multi-institutional studies 5,6,9 . Thus, it can be inferred that our local protocols were optimized in accordance with ALARA principles.…”

Section: Discussionmentioning

confidence: 99%

“…Although some authors advocate their use owing to their significant breast dose reducing effect 9,17,18 , other studies referred to increased noise level, decreased image quality, and the presence of streak and beam hardening artifacts induced by the shields 10,11 . Consequently, the American Association of Physicists in Medicine recently issued a statement on the use of bismuth shielding in CT scanning which makes note of several disadvantages to their use.…”

Section: Discussionmentioning

confidence: 99%

Iterative reconstruction of pulmonary MDCT angiography: Effects on image quality, effective dose and estimated organ dose to the breast

Žižka¹,

Ryška²,

Štěpanovská³

et al. 2014

BIOMED PAP

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Aims.To compare the image characteristics, effective dose and estimated organ dose to the female breast in pulmonary MDCT angiography (MDCTA), reconstructed with either standard filtered back projection (FBP), or iterative reconstruction in image space (IRIS). Methods. Pulmonary MDCTA performed in 116 females (age 18 -77 years; body mass index 15 -48) was reconstructed with FBP (n=52) or IRIS (n=64). Scans were acquired on a 128-row MDCT system using automatic tube current modulation, 100 kV tube voltage, and a quality reference mAs value of 120 (FBP) and 80 (IRIS). Dose was calculated from CT dose index (CTDIvol) and dose length product (DLP) values utilising ImPACT software. Image noise was measured within the pulmonary artery. Qualitative visual assessment of the scans was performed (1=negligible noise, 5=noise obscuring diagnostic information). Results. The average CTDIvol yielded 4.33 mGy for FBP and 3.54 mGy for IRIS, respectively (18.2% decrease). The average effective scan dose was 2.73±0.57 mSv (FBP) and 2.29±0.68 mSv (IRIS), respectively (16.1% decrease). The estimated average organ dose to the breast decreased from 5.1±1.1 mGy (FBP) to 4.2±1.2 mGy (IRIS, 17.6% decrease). No nondiagnostic scans (score 5) were encountered in either group. Significant improvement in image noise levels (P<0.01) and subjective image quality (P<0.02) were noted in IRIS group. Conclusion. Pulmonary MDCTA utilizing a 100 kV technique, automatic tube current modulation, and iterative image reconstruction offers robust results in routine conditions among an unselected female population, with breast doses being comparable to two-view digital mammography. Moreover, iterative reconstruction offers improvements in both image noise and visual perception of the scans, thus suggesting a potential for further dose reduction.

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“…[34] These shields allow meaningful reduction in dose to superficial organs through the absorption of lower energy dose contributing photons, while they are not degrading image quality. Applying this method was started in the early 2000s.…”

Section: Introductionmentioning

confidence: 99%

A Monte Carlo study on quantifying the amount of dose reduction by shielding the superficial organs of an Iranian 11-year-old boy

et al. 2016

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A method for minimizing organ dose during computed tomography examinations is the use of shielding to protect superficial organs. There are some scientific reports that usage of shielding technique reduces the surface dose to patients with no appreciable loss in diagnostic quality. Therefore, in this Monte Carlo study based on the phantom of a 11-year-old Iranian boy, the effect of using an optimized shield on dose reduction to body organs was quantified. Based on the impact of shield on image quality, lead shields with thicknesses of 0.2 and 0.4 mm were considered for organs exposed directly and indirectly in the scan range, respectively. The results showed that there is 50%–62% reduction in amounts of dose for organs located fully or partly in the scan range at different tube voltages and modeling the true location of all organs in human anatomy, especially the ones located at the border of the scan, range affects the results up to 49%.

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Absorbed radiation dose of the female breast during diagnostic multidetector chest CT and dose reduction with a tungsten–antimony composite breast shield: preliminary results

Cited by 27 publications

References 29 publications

Direct Quantification of Breast Dose During Coronary CT Angiography and Evaluation of Dose Reduction Strategies

Direct Quantification of Breast Dose During Coronary CT Angiography and Evaluation of Dose Reduction Strategies

Iterative reconstruction of pulmonary MDCT angiography: Effects on image quality, effective dose and estimated organ dose to the breast

A Monte Carlo study on quantifying the amount of dose reduction by shielding the superficial organs of an Iranian 11-year-old boy

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