title: Radiation Dose to the Thyroid and Gonads in Patients Undergoing Cardiac CT Angiography.
abstract: BACKGROUND
  The present data show a global increase in the rate of cardiovascular disease. Cardiac CT angiography has developed as a fast and non-invasive cardiac imaging modality following the introduction of multi-slice computed tomogaraphy.
  
  
  OBJECTIVE
  The aim of this study was to measure the radiation dose to the thyroid and pelvis regions in patients undergoing cardiac CT angiography using the Care Dose 4D method of 64-slice scanner.
  
  
  METHODS
  Eighty-one patients (41 males and 40 females) who were diagnosed with suspected coronary artery disease and were referred to Golestan Hospital, Imaging Department were recruited. Inclusion criteria were based on the protocol of multi-slice CT coronary angiography. The radiation dose to the thyroid and pelvis regions was measured using thermo luminescent dosimeters (TLDs).
  
  
  RESULTS
  The mean radiation dose to the thyroid in male and female subjects was 0.32 mSv and 0.41 mSv, respectively (P = 0.032) (total mean, 0.36 mSv). The mean radiation dose to the pelvis in male and female subjects was 81 μSv and 112 μSv, respectively (P = 0.026) (total mean, 96.5 μSv).
  
  
  CONCLUSIONS
  The total mean radiation dose to the thyroid and gonads was 0.36 mSv, and 96.5 μSv, respectively for the subjects. These values were high for one organ in a single study. Gender can affect the radiation dose to the thyroid and gonads. This can be attributed to the anatomical characteristic differences of the male and female subjects.
authors.affiliation: Department of Radiologic Technology, Faculty of Paramedicine, Jundishapur University of Medical Sciences, Ahvaz, Iran.
authors.forename: Hamid
authors.initials: H
authors.lastname: Behroozi
authors.affiliation: Department of Radiologic Technology, Faculty of Paramedicine, Jundishapur University of Medical Sciences, Ahvaz, Iran.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Davoodi
authors.affiliation: Department of Radiologic Technology, Faculty of Paramedicine, Jundishapur University of Medical Sciences, Ahvaz, Iran.
authors.forename: Shahriar
authors.initials: S
authors.lastname: Aghasi
keywords: Angiography; CT; Dose; Pelvic; Radiation; Thyroid