Abstract
Solid-state detectors (SSDs) may be used along with a lead collimator for half-value layer (HVL) measurement using computed tomography (CT) with or without a tin filter. We aimed to compare HVL measurements obtained using three SSDs (AGMS-DM+ , X2 R/F sensor, and Black Piranha) with those obtained using the single-rotation technique with lead apertures (SRTLA). HVL measurements were performed using spiral CT at tube voltages of 70–140 kV without a tin filter and 100–140 kV (Sn 100–140 kV) with a tin filter in increments of 10 kV. For SRTLA, a 0.6-cc ionization chamber was suspended at the isocenter to measure the free-in-air kerma rate (\(\dot{K}_{\text{air}}\)) values. Five apertures were made on the gantry cover using lead sheets, and four aluminum plates were placed on these apertures. HVLs in SRTLA were obtained from \(\dot{K}_{\text{air}}\) decline curves. Subsequently, SSDs inserted into the lead collimator were placed on the gantry cover and used to measure HVLs. Maximum HVL differences of AGMS-DM+ , X2 R/F sensor, and Black Piranha with respect to SRTLA without/with a tin filter were − 0.09/0.6 (only two Sn 100–110 kV) mm, − 0.50/ − 0.6 mm, and − 0.17/(no data available) mm, respectively. These values were within the specification limit. SSDs inserted into the lead collimator could be used to measure HVL using spiral CT without a tin filter. HVLs could be measured with a tin filter using only the X2 R/F sensor, and further improvement of its calibration accuracy with respect to other SSDs is warranted.
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References
Zeman RK, Fox SH, Silverman PM, et al. Helical (spiral) CT of the abdomen. AJR Am J Roentgenol. 1993;160:719–25. https://doi.org/10.2214/ajr.160.4.8456652.
Hu H. Multi-slice helical CT: scan and reconstruction. Med Phys. 1999;26:5–18. https://doi.org/10.1118/1.598470.
Taguchi K, Aradate H. Algorithm for image reconstruction in multi-slice helical CT. Med Phys. 1998;25:550–61. https://doi.org/10.1118/1.598230.
Fukuda A, Lin PJ, Matsubara K, Miyati T. Measurement of gantry rotation time in modern ct. J Appl Clin Med Phys. 2014;15:4517. https://doi.org/10.1120/jacmp.v15i1.4517.
Bodelle B, Fischbach C, Booz C, et al. Single-energy pediatric chest computed tomography with spectral filtration at 100 kVp: effects on radiation parameters and image quality. Pediatr Radiol. 2017;47:831–7. https://doi.org/10.1007/s00247-017-3813-1.
Steidel J, Maier J, Sawall S, Kachelrieß M. Dose reduction potential in diagnostic single energy CT through patient-specific prefilters and a wider range of tube voltages. Med Phys. 2022;49:93–106. https://doi.org/10.1002/mp.15355.
Mozaffary A, Trabzonlu TA, Kim D, Yaghmai V. Comparison of tin filter-based spectral shaping CT and low-dose protocol for detection of urinary calculi. AJR Am J Roentgenol. 2019;212(4):808–14. https://doi.org/10.2214/AJR.18.20154.
Zhou W, Malave MN, Maloney JA, et al. Radiation dose reduction using spectral shaping in pediatric non-contrast sinus CT. Pediatr Radiol. 2023;53(10):2069–78. https://doi.org/10.1007/s00247-023-05699-2.
Choi YS, Choo HJ, Lee SJ, Kim DW, Han JY, Kim DS. Computed tomography arthrography of the shoulder with tin filter-based spectral shaping at 100 kV and 140 kV. Acta Radiol. 2021;62(10):1349–57. https://doi.org/10.1177/0284185120965551.
Huflage H, Grunz JP, Hackenbroch C, et al. Metal artefact reduction in low-dose computed tomography: Benefits of tin prefiltration versus postprocessing of dual-energy datasets over conventional CT imaging. Radiography (Lond). 2022;28(3):690–6. https://doi.org/10.1016/j.radi.2022.05.006.
Samei E, Bakalyar D, Boedeker KL, et al. Performance evaluation of computed tomography systems: summary of AAPM Task Group 233. Med Phys. 2019;46:e735–56. https://doi.org/10.1002/mp.13763.
Kruger RL, McCollough CH, Zink FE. Measurement of half-value layer in x-ray CT: a comparison of two noninvasive techniques. Med Phys. 2000;27:1915–9. https://doi.org/10.1118/1.1287440.
Japanese Industrial Standards. JIS Z 4751-2-44: 2018, Medical electrical equipment - Part 2-44: Particular requirements for the basic safety and essential performance of X-ray equipment for computed tomography. Japanese standards association. 2018.
Matsubara K, Lin PP, Fukuda A, Koshida K. Differences in behavior of tube current modulation techniques for thoracic CT examinations between male and female anthropomorphic phantoms. Radiol Phys Technol. 2014;7:316–28. https://doi.org/10.1007/s12194-014-0269-y.
Bazalova M, Verhaegen F. Monte Carlo simulation of a computed tomography x-ray tube. Phys Med Biol. 2007;52(19):5945–55. https://doi.org/10.1088/0031-9155/52/19/015.
McKenney SE, Seibert JA, Burkett GW, et al. Real-time dosimeter employed to evaluate the half-value layer in CT. Phys Med Biol. 2014;59:363–77. https://doi.org/10.1088/0031-9155/59/2/363.
Fukuda A, Ichikawa N, Tashiro M, Yamao T, Murakami K, Kubo H. Measurement of the half-value layer for CT systems in a single-rotation technique: reduction of stray radiation with lead apertures. Phys Med. 2020;76:221–6. https://doi.org/10.1016/j.ejmp.2020.07.004.
Okkalides D, Arvanitides D. Aberrations in X-ray output waveforms of radiological generators. Eur J Radiol. 1992;15:248–51. https://doi.org/10.1016/0720-048x(92)90117-r.
Lin PP, Goode AR. Accuracy of HVL measurements utilizing solid state detectors for radiography and fluoroscopy X-ray systems. J Appl Clin Med Phys. 2021;22:339–44. https://doi.org/10.1002/acm2.13389.
Akaishi H, Takeda H, Kanazawa Y, Yoshii Y, Asanuma O. Development of a lead-covered case for a wireless X-ray output analyzer to perform CT half-value layer measurements. Nihon Hoshasen Gijutsu Gakkai Zasshi. 2016;72:244–50. https://doi.org/10.6009/jjrt.2016_JSRT_72.3.244.
Moriwake R, Takei Y, Kuroda T, Ikenaga H. Experiment of a dedicated lead slit for X-ray output analyzer in X-ray CT half-value layer measurements. Nihon Hoshasen Gijutsu Gakkai Zasshi. 2022;78:152–8. https://doi.org/10.6009/jjrt.780202.
Giavarina D. Understanding Bland Altman analysis. Biochem Med (Zagreb). 2015;25(2):141–51. https://doi.org/10.11613/BM.2015.015. (eCollection 2015).
Schober P, Boer C, Schwarte LA. Correlation coefficients: appropriate use and interpretation. Anesth Analg. 2018;126:1763–8. https://doi.org/10.1213/ANE.0000000000002864.
The R project for statistical computing. https://www.r-project.org/. Accessed 13 Jan 2023.
Greffier J, Pereira F, Hamard A, Addala T, Beregi JP, Frandon J. Effect of tin filter-based spectral shaping CT on image quality and radiation dose for routine use on ultralow-dose CT protocols: a phantom study. Diagn Interv Imaging. 2020;101(6):373–81. https://doi.org/10.1016/j.diii.2020.01.002.
Fukuda A, Lin PP, Ichikawa N, Matsubara K. Estimation of primary radiation output for wide-beam computed tomography scanner. J Appl Clin Med Phys. 2019;20(6):152–9. https://doi.org/10.1002/acm2.12598.
Unfors T. Detector for detecting x-ray radiation parameters. US patent No. 9405021. 2016. https://www.freepatentsonline.com/9405021.html. Accessed 13 Jan 2023.
Nomura K, Fujii K, Goto T, et al. Radiation dose reduction for computed tomography localizer radiography using an Ag additional filter. J Comput Assist Tomogr. 2021;45:84–92. https://doi.org/10.1097/RCT.0000000000001026.
Zhou LN, Zhao SJ, Wang RB, Wang YW, Yang SX, Wu N. Comparison of radiation dose and image quality between split-filter twin-beam dual-energy images and single-energy images in single-source contrast-enhanced chest computed tomography. J Comput Assist Tomogr. 2021;45:888–93. https://doi.org/10.1097/RCT.0000000000001220.
Mahoney R, Pavitt CW, Gordon D, et al. Clinical validation of dual-source dual-energy computed tomography (DECT) for coronary and valve imaging in patients undergoing trans-catheter aortic valve implantation (TAVI). Clin Radiol. 2014;69:786–94. https://doi.org/10.1016/j.crad.2014.03.010.
Matsubara K, Nagata H, Okubo R, Takata T, Kobayashi M. Method for determining the half-value layer in computed tomography scans using a real-time dosimeter: application to dual-source dual-energy acquisition. Phys Med. 2017;44:227–31. https://doi.org/10.1016/j.ejmp.2017.10.020.
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Atsushi Fukuda receives research support from Toyo Medic Co., Ltd.
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Atsushi Fukuda received a research grant from Toyo Medic Corporation for research in the HVL measurements in the CT system. Other authors have no conflict of interest to declare.
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Fukuda, A., Ichikawa, N., Hayashi, T. et al. Half-value layer measurements using solid-state detectors and single-rotation technique with lead apertures in spiral computed tomography with and without a tin filter. Radiol Phys Technol 17, 207–218 (2024). https://doi.org/10.1007/s12194-023-00767-6
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DOI: https://doi.org/10.1007/s12194-023-00767-6