Document Detail

Image quality assessment and medical physics evaluation of different portable dental X-ray units.
MedLine Citation:
PMID:  20554135     Owner:  NLM     Status:  MEDLINE    
INTRODUCTION: Recently developed portable dental X-ray units increase the mobility of the forensic odontologists and allow more efficient X-ray work in a disaster field, especially when used in combination with digital sensors. This type of machines might also have potential for application in remote areas, military and humanitarian missions, dental care of patients with mobility limitation, as well as imaging in operating rooms.
OBJECTIVE: To evaluate radiographic image quality acquired by three portable X-ray devices in combination with four image receptors and to evaluate their medical physics parameters.
MATERIALS AND METHODS: Images of five samples consisting of four teeth and one formalin-fixed mandible were acquired by one conventional wall-mounted X-ray unit, MinRay 60/70 kVp, used as a clinical standard, and three portable dental X-ray devices: AnyRay 60 kVp, Nomad 60 kVp and Rextar 70 kVp, in combination with a phosphor image plate (PSP), a CCD, or a CMOS sensor. Three observers evaluated images for standard image quality besides forensic diagnostic quality on a 4-point rating scale. Furthermore, all machines underwent tests for occupational as well as patient dosimetry.
RESULTS: Statistical analysis showed good quality imaging for all system, with the combination of Nomad and PSP yielding the best score. A significant difference in image quality between the combination of the four X-ray devices and four sensors was established (p<0.05). For patient safety, the exposure rate was determined and exit dose rates for MinRay at 60 kVp, MinRay at 70 kVp, AnyRay, Nomad and Rextar were 3.4 mGy/s, 4.5 mGy/s, 13.5 mGy/s, 3.8 mGy/s and 2.6 mGy/s respectively. The kVp of the AnyRay system was the most stable, with a ripple of 3.7%. Short-term variations in the tube output of all the devices were less than 10%. AnyRay presented higher estimated effective dose than other machines. Occupational dosimetry showed doses at the operator's hand being lowest with protective shielding (Nomad: 0.1 microGy). It was also low while using remote control (distance>1m: Rextar <0.2 microGy, MinRay <0.1 microGy).
CONCLUSIONS: The present study demonstrated the feasibility of three portable X-ray systems to be used for specific indications, based on acceptable image quality and sufficient accuracy of the machines and following the standard guidelines for radiation hygiene.
Pisha Pittayapat; Christiano Oliveira-Santos; Patrick Thevissen; Koen Michielsen; Niki Bergans; Guy Willems; Deborah Debruyckere; Reinhilde Jacobs
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Forensic science international     Volume:  201     ISSN:  1872-6283     ISO Abbreviation:  Forensic Sci. Int.     Publication Date:  2010 Sep 
Date Detail:
Created Date:  2010-08-04     Completed Date:  2010-12-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7902034     Medline TA:  Forensic Sci Int     Country:  Ireland    
Other Details:
Languages:  eng     Pagination:  112-7     Citation Subset:  IM    
Copyright Information:
Copyright 2010 Elsevier Ireland Ltd. All rights reserved.
Oral Imaging Center, Faculty of Medicine, School of Dentistry, KU Leuven, Kapucijnenvoer 7, Leuven B-3000, Belgium.
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MeSH Terms
Forensic Dentistry / instrumentation
Occupational Exposure
Quality Control
Radiation Dosage*
Radiography, Dental / instrumentation*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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