Document Detail


A method to derive appropriate exposure parameters from target exposure index and patient thickness in pediatric digital radiography.
MedLine Citation:
PMID:  23208532     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND: Little information exists concerning appropriate exposure and measuring overall patient dose in pediatric digital radiography. OBJECTIVE: To establish a convenient method of appropriate exposure from target exposure index (EI) and thickness in pediatric digital radiography and estimate patient entrance-surface dose (ESD) and dose-area product (DAP) associated with chest, abdomen and pelvis radiography. MATERIALS AND METHODS: A formula was deduced to calculate appropriate mAs changed with children's weight and height. EI was used to control image quality. With this formula, dose-optimized procedures were carried out. Data were collected from 180 pediatric examinations, including chest, abdomen and pelvis anterior-posterior (AP) projections. The children were divided into the following age bands: newborns (0-28 days), infants (28 days-2 years) and older children (2-7 years). In each age band, ten children were exposed with the calculated appropriate mAs and EI values were kept steady in appropriate range (referred as target group) and ten children were exposed to the factors routinely used in practice (referred to as the routine group). DAP to children was measured with a DAP meter, and ESD was calculated using measured DAP and data from the National Radiological Protection Board. Data were compared between groups. RESULTS: ESD ranges in the target group were 32-202 μGy (chest AP), 57-333 μGy (abdomen AP) and 52-372 μGy (pelvis AP). For every radiographic procedure, chi-square Student's t tests showed a significant difference in average ESD and DAP between the two groups (P < 0.005). Most ESD values from the routine group were two times higher than those from the target group. CONCLUSIONS: The study established a convenient method to set appropriate exposure parameters (mAs) to reach a target EI using the child's weight and height in pediatric radiography. By this method, ESD and DAP can be significantly reduced in children.
Authors:
Menglong Zhang; Kai Liu; Xuecai Niu; Xinli Liu
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-4
Journal Detail:
Title:  Pediatric radiology     Volume:  -     ISSN:  1432-1998     ISO Abbreviation:  Pediatr Radiol     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0365332     Medline TA:  Pediatr Radiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Radiography, Shandong Medical Imaging Research Institute, Jingwu Road 324, Jinan, 250021, Shangdong, China, menglongzhang@163.com.
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