Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/3747
Título: Increasing source to image distance for AP pelvis imaging: impact on radiation dose and image quality
Autor: Tugwell, J.
Everton, C.
Kingma, A.
Oomkens, D. M.
Pereira, G. A.
Pimentinha, D. B.
Rouiller, C. A.
Stensrud, S. M.
Kjelle, E.
Jorge, José
Hogg, Peter
Palavras-chave: Radiology
Effective dose
Entrance surface dose
Image quality
Computed radiography
Data: Jun-2014
Editora: Elsevier
Citação: Tugwell 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].
Resumo: Aim - 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.
Peer review: yes
URI: http://hdl.handle.net/10400.21/3747
DOI: 10.1016/j.radi.2014.05.012
Versão do Editor: http://www.sciencedirect.com/science/article/pii/S1078817414000674#
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