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Coronary calcium scoring with MDCT: the radiation dose to the breast and the effectiveness of bismuth breast shield.

Abstract：

OBJECTIVE:The purpose of our study was to determine the breast radiation dose during coronary calcium scoring with multidetector computerized tomography (MDCT). We also evaluated the degree of dose reduction by using a bismuth breast shield when performing coronary calcium scoring with MDCT. MATERIALS AND METHODS:The dose reduction achievable by shielding the adult (35 years or older) female breasts was studied in 25 women who underwent coronary calcium scoring with MDCT. All examinations were performed with a 16-MDCT scanner. To compare the shielded versus unshielded breast dose, the examinations were performed with (right breast) and without (left breast) breast shielding in all patients. With this technique the superficial breast doses were calculated. To determine the average glandular breast radiation dose, we imaged an anthropomorphic dosimetric phantom into which calibrated dosimeters were placed to measure the dose to the breast. The phantom was imaged using the same protocol. Radiation doses to the breasts with and without the breast shielding were measured and compared using the Student's t-test. RESULTS:The mean radiation doses with and without the breast shield were 5.71+/-1.1 mGy versus 9.08+/-1.5 mGy, respectively. The breast shield provided a 37.12% decrease in radiation dose to the breast with shielding. The difference between the dose received by the breasts with and without bismuth shielding was significant, with a p-value of less than 0.001. CONCLUSION:The high radiation during MDCT greatly exceeds the recommended doses and should not be underestimated. Bismuth in plane shielding for coronary calcium scoring with MDCT decreased the radiation dose to the breast. We recommend routine use of breast shields in female patients undergoing calcium scoring with MDCT.

journal_name

Eur J Radiol

journal_title

European journal of radiology

authors

Yilmaz MH,Yaşar D,Albayram S,Adaletli I,Ozer H,Ozbayrak M,Mihmanli I,Akman C

doi

10.1016/j.ejrad.2006.08.012

subject

Has Abstract

pub_date

2007-01-01 00:00:00

pages

139-43

issue

1

eissn

0720-048X

issn

1872-7727

pii

S0720-048X(06)00332-9

journal_volume

61

pub_type

杂志文章

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