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Increasing source to image distance for AP pelvis imaging: impact on radiation dose and image quality

2014-06Journal article Restricted access
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dc.contributor.authorTugwell, J.
dc.contributor.authorEverton, C.
dc.contributor.authorKingma, A.
dc.contributor.authorOomkens, D. M.
dc.contributor.authorPereira, G. A.
dc.contributor.authorPimentinha, D. B.
dc.contributor.authorRouiller, C. A.
dc.contributor.authorStensrud, S. M.
dc.contributor.authorKjelle, E.
dc.contributor.authorJorge, José
dc.contributor.authorHogg, Peter
dc.date.accessioned2014-08-08T09:53:06Z
dc.date.available2014-08-08T09:53:06Z
dc.date.issued2014-06
dc.description.abstractAim - A quantative primary study to determine whether increasing source to image distance (SID), with and without the use of automatic exposure control (AEC) for antero-posterior (AP) pelvis imaging, reduces dose whilst still producing an image of diagnostic quality. Methods - Using a computed radiography (CR) system, an anthropomorphic pelvic phantom was positioned for an AP examination using the table bucky. SID was initially set at 110 cm, with tube potential set at a constant 75 kVp, with two outer chambers selected and a fine focal spot of 0.6 mm. SID was then varied from 90 cm to 140 cm with two exposures made at each 5 cm interval, one using the AEC and another with a constant 16 mAs derived from the initial exposure. Effective dose (E) and entrance surface dose (ESD) were calculated for each acquisition. Seven experienced observers blindly graded image quality using a 5-point Likert scale and 2 Alternative Forced Choice software. Signal-to-Noise Ratio (SNR) was calculated for comparison. For each acquisition, femoral head diameter was also measured for magnification indication. Results - Results demonstrated that when increasing SID from 110 cm to 140 cm, both E and ESD reduced by 3.7% and 17.3% respectively when using AEC and 50.13% and 41.79% respectively, when the constant mAs was used. No significant statistical (T-test) difference (p = 0.967) between image quality was detected when increasing SID, with an intra-observer correlation of 0.77 (95% confidence level). SNR reduced slightly for both AEC (38%) and no AEC (36%) with increasing SID. Conclusion - For CR, increasing SID significantly reduces both E and ESD for AP pelvis imaging without adversely affecting image quality.por
dc.identifier.citationTugwell J, Everton C, Kingma A, Oomkens DM, Pereira GA, Pimentinha DB, et al. Increasing source to image distance for AP pelvis imaging: impact on radiation dose and image quality. Radiography. 2014:1-5. [Epub ahead of print].por
dc.identifier.doi10.1016/j.radi.2014.05.012
dc.identifier.urihttp://hdl.handle.net/10400.21/3747
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevierpor
dc.relation.publisherversionhttp://www.sciencedirect.com/science/article/pii/S1078817414000674#por
dc.subjectRadiologypor
dc.subjectEffective dosepor
dc.subjectEntrance surface dosepor
dc.subjectImage qualitypor
dc.subjectComputed radiographypor
dc.titleIncreasing source to image distance for AP pelvis imaging: impact on radiation dose and image qualitypor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage5por
oaire.citation.startPage1por
oaire.citation.titleRadiographypor
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor

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