PMID- 24876925
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20140530
LR  - 20220311
IS  - 1949-8470 (Print)
IS  - 1949-8470 (Electronic)
IS  - 1949-8470 (Linking)
VI  - 6
IP  - 5
DP  - 2014 May 28
TI  - Size-specific dose estimates: Localizer or transverse abdominal computed 
      tomography images?
PG  - 210-7
LID - 10.4329/wjr.v6.i5.210 [doi]
AB  - AIM: To investigate effect of body dimensions obtained from localizer radiograph 
      and transverse abdominal computed tomography (CT) images on Size Specific Dose 
      Estimate. METHODS: This study was approved by Institutional Review Board and was 
      compliant with Health Insurance Portability and Accountability Act. Fifty 
      patients with abdominal CT examinations (58 +/- 13 years, Male:Female 28:22) were 
      included in this study. Anterior-posterior (AP) and lateral (Lat) diameters were 
      measured at 5 cm intervals from the CT exam localizer radiograph (simple X-ray 
      image acquired for planning the CT exam before starting the scan) and transverse 
      CT images. Average of measured AP and Lat diameters, as well as maximum, minimum 
      and mid location AP and Lat were measured on both image sets. In addition, off 
      centering of patients from the gantry iso-center was calculated from the 
      localizers. Conversion factors from American Association of Physicists in 
      Medicine (AAPM) report 204 were obtained for AP, Lat, AP + Lat, and effective 
      diameter ( radical AP * Lat) to determine size specific dose estimate (SSDE) from the CT 
      dose index volume (CTDIvol) recorded from the dose reports. Data were analyzed 
      using SPSS v19. RESULTS: Total number of 5376 measurements was done. In some 
      patients entire body circumference was not covered on either projection 
      radiograph or transverse CT images; hence accurate measurement of AP and Lat 
      diameters was not possible in 11% (278/2488) of locations. Forty one patients 
      were off-centered with mean of 1.9 +/- 1.8 cm (range: 0.4-7 cm). Conversion factors 
      for attained diameters were not listed on AAPM look-up tables in 3% (80/2488) of 
      measurements. SSDE values were significantly different compared to CTDIvol, 
      ranging from 32% lower to 74% greater than CTDIvol. CONCLUSION: There is 
      underestimation and overestimation of dose comparing SSDE values to CTDIvol. 
      Localizer radiographs are associated with overestimation of patient size and 
      therefore underestimation of SSDE.
FAU - Pourjabbar, Sarvenaz
AU  - Pourjabbar S
AD  - Sarvenaz Pourjabbar, Sarabjeet Singh, Atul Padole, Akshay Saini, Michael A Blake, 
      Mannudeep K Kalra, Department of Radiology, Massachusetts General Hospital, 
      Boston, MA 02114, United States.
FAU - Singh, Sarabjeet
AU  - Singh S
AD  - Sarvenaz Pourjabbar, Sarabjeet Singh, Atul Padole, Akshay Saini, Michael A Blake, 
      Mannudeep K Kalra, Department of Radiology, Massachusetts General Hospital, 
      Boston, MA 02114, United States.
FAU - Padole, Atul
AU  - Padole A
AD  - Sarvenaz Pourjabbar, Sarabjeet Singh, Atul Padole, Akshay Saini, Michael A Blake, 
      Mannudeep K Kalra, Department of Radiology, Massachusetts General Hospital, 
      Boston, MA 02114, United States.
FAU - Saini, Akshay
AU  - Saini A
AD  - Sarvenaz Pourjabbar, Sarabjeet Singh, Atul Padole, Akshay Saini, Michael A Blake, 
      Mannudeep K Kalra, Department of Radiology, Massachusetts General Hospital, 
      Boston, MA 02114, United States.
FAU - Blake, Michael A
AU  - Blake MA
AD  - Sarvenaz Pourjabbar, Sarabjeet Singh, Atul Padole, Akshay Saini, Michael A Blake, 
      Mannudeep K Kalra, Department of Radiology, Massachusetts General Hospital, 
      Boston, MA 02114, United States.
FAU - Kalra, Mannudeep K
AU  - Kalra MK
AD  - Sarvenaz Pourjabbar, Sarabjeet Singh, Atul Padole, Akshay Saini, Michael A Blake, 
      Mannudeep K Kalra, Department of Radiology, Massachusetts General Hospital, 
      Boston, MA 02114, United States.
LA  - eng
PT  - Journal Article
PL  - United States
TA  - World J Radiol
JT  - World journal of radiology
JID - 101538184
PMC - PMC4037547
OTO - NOTNLM
OT  - Computed tomography dose index
OT  - Radiation dose optimization
OT  - Radiation dose reduction
OT  - Size specific dose estimate
EDAT- 2014/05/31 06:00
MHDA- 2014/05/31 06:01
PMCR- 2014/05/28
CRDT- 2014/05/31 06:00
PHST- 2013/11/08 00:00 [received]
PHST- 2014/04/17 00:00 [revised]
PHST- 2014/05/08 00:00 [accepted]
PHST- 2014/05/31 06:00 [entrez]
PHST- 2014/05/31 06:00 [pubmed]
PHST- 2014/05/31 06:01 [medline]
PHST- 2014/05/28 00:00 [pmc-release]
AID - 10.4329/wjr.v6.i5.210 [doi]
PST - ppublish
SO  - World J Radiol. 2014 May 28;6(5):210-7. doi: 10.4329/wjr.v6.i5.210.