Evaluation of CT Acquisition Protocols Effect on Hounsfield Units and Optimization of CT-RED Calibration Curve Selection in Radiotherapy Treatment Planning Systems

Nhila, Oussama; Talbi, Mohammed; Mansouri, M’hamed El; Katib, Mahmoud EL; Chakir, E.

doi:10.3103/s0027134922040105

Cited by 10 publications

(3 citation statements)

References 24 publications

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“…[6][7][8][9] However, these variations can affect the HU values. 4,10,11 In this context, Zurl et al concluded that the use of different CT protocols leads to variations of up to 20% in HU values. 11 A number of studies have quantified the dose change in the radiation therapy planning process due to HU variation.…”

Section: Introductionmentioning

confidence: 99%

“…In our previous study, the effect of CT acquisition protocols on HUs for this brand of scanner has been investigated. 10 It was concluded that changing the reconstruction filter from body to head and using beam hardening correction (BHC) significantly affects HU in dense bone. Moreover, this study was conducted with a single energy (120 kVp).…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, several studies have investigated the effect of acquisition parameters, 10,13,19,20 type of scanner 21,22 and type of phantom 23,24 on the HU variation. The most influential parameters are the voltage tube 12,25,26 and the reconstruction filters, whereas, for this last, the HU change depends on the brand of scanner.…”

Section: Introductionmentioning

confidence: 99%

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The effect of CT reconstruction filter selection on Hounsfield units in radiotherapy treatment planning

et al. 2023

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Introduction: This work aims to evaluate the effect of Hitachi 16-slice scanner reconstruction filters on Hounsfield unit (HU) variations. In the literature, there is a lack of information from a wide variety of scanners in this regard. In addition, not all studies have investigated the effect of reconstruction filters on HU in an exhaustive way. Methods: The computerised imaging reference system electron density phantom (model 062M) was scanned with different substitute materials of different density from Hitachi 16-slice computed tomography. The raw images were obtained with four tube voltage settings: 80 kVp, 100 kVp, 120 kVp and 140 kVp. The raw images for each energy level were then reconstructed using different reconstruction filters. Results: The HU values of dense bone were significantly different when changing the reconstruction filters without beam hardening correction (BHC). Nevertheless, when selecting the BHC, this variation decreases heavily for 80 kVp and decreases slightly for 140 kVp, but it remains outside the tolerance of ±50 HU. However, for 100 kVp and 120 kVp, the differences in HU values become within the tolerances indicated for dense bone. Conclusions: Changing image reconstruction filters during a dosimetric scan had a significant effect on HU in dense bone. Therefore, it is recommended to evaluate this effect during the commissioning phase. As a result, this study provides a methodology to comprehensively investigate the effect of reconstruction filters on HU.

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