Effective dose and image optimisation of lateral lumbar spine radiography : a phantom study

Lai, Zer Hau (Discipline of Medical Radiation Sciences, School of Molecular and Life Sciences, Curtin University, Perth, Australia) ; Sá Dos Reis, Cláudia (Discipline of Medical Radiation Sciences, School of Molecular and Life Sciences, Curtin University, Perth, Australia; HESAV School of Health Sciences, HES-SO University of Applied Sciences and Arts Western Switzerland; NOVA National School of Public Health, Public Health Research Centre, Universidade NOVA de Lisboa, Lisbon, Portugal) ; Sun, Zhonghua (Discipline of Medical Radiation Sciences, School of Molecular and Life Sciences, Curtin University, Perth, Australia)

Background: To investigate lateral lumbar spine radiography technical parameters for reduction of effective dose whilst maintaining image quality (IQ). Methods: Thirty-six radiograms of an anthropomorphic phantom were acquired using different exposure parameters: source-to-detector distance (SDD) (100, 130 or 150 cm), tube potential (75, 85 or 95 kVp), tube current × exposure time product (4.5, 9, 18 mAs) and additional copper (Cu) filter (no filter, 0.1-, 0.2-, or 0.3-mm thickness. IQ was assessed using an objective approach (contrast-to-noise-ratio [CNR] calculation and magnification measurement) and a perceptual approach (six observers); ED was estimated using the PCXMC 2.0 software. Descriptive statistics, paired t test, and intraclass correlation coefficient (ICC) were used. Results:The highest ED (0.022 mSv) was found with 100 cm SSD, 75 kVp, 18 mAs, and without Cu filter, whilst the highest CNR (7.23) was achieved at 130 cm SSD, 75 kVp, 18 mAs, and without Cu filter. The lowest ED and CNR were generated at 150 cm SDD, 95 kVp, 4.5 mAs, and 0.3-mm Cu filter. All observers identified the relevant anatomical structures on all images with the lowest ED and IQ. The intra-observer (0.61–0.79) and inter-observer (0.55–0.82) ICC ranged from moderate to excellent. Conclusion:All relevant anatomical structures were identified on the lateral lumbar spine radiographs despite using low-dose protocols. The lowest ED (0.002 mSv) was obtained with 150 cm SDD, 95 kVp, 4.5 mAs, and 0.3-mm Cu filter. Further technical and clinical studies are needed to verify these preliminary findings


Article Type:
scientifique
Faculty:
Santé
Branch:
Technique en radiologie médicale
School:
HESAV
Institute:
Unité de recherche en santé, HESAV
Date:
2020-02
Pagination:
9 p.
Published in:
European radiology experimental
Numeration (vol. no.):
February 2020, vol. 4, no. 1, art. 13
DOI:
ISSN:
2509-9280
Appears in Collection:



 Record created 2020-02-21, last modified 2020-02-25

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