Comparison of gray values of cone-beam computed tomography with hounsfield units of multislice computed tomography: An in vitro study

Patrick, Sanjana; Birur, Praveen; Gurushanth, Keerthi; Raghavan, Anil; Gurudath, Shubha

doi:10.4103/ijdr.ijdr_415_16

Cited by 71 publications

(24 citation statements)

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“…Patrick et al . [ 11 ] in the year 2017 evaluated the correlation between Hounsfield units of multislice computed tomography (MSCT) scans and greyscale values in CBCT in various fields of view for hyperdense as well as hypodense structures. It was found that the grey values for hypodense structures in large-volume CBCT scans were more reliable and analogous to Hounsfield units in MSCT.…”

Section: Discussionmentioning

confidence: 99%

Cone beam computed tomography – extending its arm to explore new possibilities

et al. 2020

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Purpose: To determine whether the greyscale value depicted in cone beam computed tomography (CBCT) differentiates different benign osseous lesions of jaws and to measure the greyscale value of various osseous lesions of jaws and to find the correlation (if any) of these greyscale values to that of histopathological diagnosis. Material and methods: This study was conducted in the Department of Oral Medicine and Radiology of the Dental Institute after obtaining approval from the Ethical Committee. CBCT scans of osseous lesions of jaws confirmed with histopathological reports depicting cystic or tumour-like lesions were included in the study. Greyscale values depicted in CBCT scans of osseous lesions were measured. The greyscale values were grouped as per the histopathological diagnosis, and these ranges were then tabulated and statistically evaluated. Results: The mean value with standard deviation of greyscale values for cystic lesions was 1208.375 ± 93 and for that of the tumour group was 1603 ± 425.5. Conclusions: The greyscale value is a useful tool in differentiating between different groups of osseous lesions of jaws.

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Section: Discussionmentioning

confidence: 99%

Cone beam computed tomography – extending its arm to explore new possibilities

et al. 2020

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“…Besides this, the subjectively chosen grey values 201 and lower to measure the volume, marginal and internal void are arguable. These grey values are more reliable in CBCT than Hounsfield Units [36, 37]. But small movements of the model in the CBCT resulted in small deviant grey values.…”

Section: Discussionmentioning

confidence: 99%

Marginal and internal fit of 3D printed resin graft substitutes mimicking alveolar ridge augmentation: An in vitro pilot study

et al. 2019

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Recent improvements in additive manufacturing technologies may facilitate the use of customized 3D printed grafts for horizontal and vertical augmentation of the atrophic alveolar ridge. The accurate fit of such grafts could reduce the clinical treatment time and contribute optimal bone regeneration. The aim of this in vitro study was to evaluate the marginal and internal fit of 3D printed resin grafts as they could be used for alveolar ridge augmentation. Alveolar ridge morphologic data were derived from the Cone Beam Computed Tomography (CBCT) scans of six patients with alveolar bone defects. These data were transferred to a segmentation program to produce virtual 3D reconstructions of the alveolar ridge models. Using a Computer Aided Design (CAD) program, the alveolar bone defects were defined and customized grafts were designed and both the defects as well as the grafts generated (CAM) as 3D projects. These projects were imported into a 3D printer and were manufactured in resin. Hereafter, the grafts were fitted to the defect sites of the corresponding models and new CBCT scans were performed. Based on these scans, measurements were made at the marginal and internal part of the fitted grafts to evaluate the marginal and internal fit, respectively. The statistical analysis revealed that the mean marginal fit was significantly better (P < 0.05) than the mean internal fit. The fit of the grafts was dependent on the shape and on the size of the grafts. Specifically, the total void surface between the fitted graft and the corresponding defect site was significantly larger in the large-defect grafts than the small-defect grafts (P < 0.05). Within the limitations of the study, it could be demonstrated that it is possible to fabricate 3D printed resin grafts with acceptable fit in customized shapes, when combining CBCT scans and computer aided design and 3D printing techniques.

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“…The corridor’s dimensions were defined to allow screw positioning if that bore probe with a diameter of 7.5 mm would not affect surrounding cortical bone along the corridor except for the entry and exit points. Affecting cortical bone was defined by exceeding a threshold of 400 HU 27 – 29 . This calculation was performed on the overall mean model and on both pubic ramus of all bone models resulting in a total of 300 individual bore probes available for evaluation.…”

Section: Methodsmentioning

confidence: 99%

Anatomical evaluation of the transpubic screw corridor based on a 3D statistical model of the pelvic ring

Arand

Wagner

Richards

et al. 2021

Sci Rep

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Retrograde transpubic screw fixation is a common procedure for the treatment of anterior pelvic ring fractures. With its sparing surgical approach and significant pain relief after screw fixations allowing early mobilisation, it has gained importance especially in the treatment of insufficiency fractures in elderly patients. However, positioning of transpubic screw osteosynthesis is not always possible due to narrowness and curvature of the screw corridor. The aim of the present study was to evaluate availability and length of the screw corridor using a 3D statistical model of the pelvic ring consisting out of 150 uninjured pelves. Virtual bore probes with a diameter of 7.5 mm were analysed as to accessibility, length and grey value distribution in Hounsfield Unit (HU). A transpubic corridor with a diameter of ≥ 7.5 mm was available in 185 of 300 investigated superior pubic rami with mean screw length of 131.7 mm. Accessibility of the screw corridor was higher in males than in females. However, screw length showed no systematic differences between the sexes or ethnicities. Analysis of the grey value distribution demonstrated the strongest bone to be located at the lateral ilium and the supraacetabular region.

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Comparison of gray values of cone-beam computed tomography with hounsfield units of multislice computed tomography: An in vitro study

Abstract: The gray value for hypodense structures in large volume CBCT scan was more reliable and analogous to HU value in MSCT. The determination of grey values in CBCT may not be as accurate as HU value in CT for hyperdense structures.

Cited by 71 publications

References 0 publications

Cone beam computed tomography – extending its arm to explore new possibilities

Cone beam computed tomography – extending its arm to explore new possibilities

Marginal and internal fit of 3D printed resin graft substitutes mimicking alveolar ridge augmentation: An in vitro pilot study

Anatomical evaluation of the transpubic screw corridor based on a 3D statistical model of the pelvic ring

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