A Comparative Study on the Voxel Values in Alveolar Bones Acquired by MDCT and Newly Developed Dental Dual-Energy CBCT

Chang, Sung-Ho; Lee, Sang Chul

doi:10.3390/s21227552

Cited by 6 publications

(6 citation statements)

References 26 publications

(29 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Second, despite its steadily growing use, WBCT is not available in all orthopaedic centers. It could be argued that the present analysis of BMD could have been carried out with conventional CT; however, the radiation exposure would have been higher 44 and it would not have been possible to assess alignment under weight-bearing conditions 45 . Also, the bone density ratio could be affected by whole lower limb alignment, but we were not able to investigate this because the device enabling whole-limb WBCT was not available at our institution at the time of the study.…”

Section: Discussionmentioning

confidence: 99%

Ankle Joint Bone Density Distribution Correlates with Overall 3-Dimensional Foot and Ankle Alignment

Lintz,

Bernasconi,

Buedts

et al. 2023

Journal of Bone and Joint Surgery

View full text Add to dashboard Cite

Background: Altered stress distribution in the lower limb may impact bone mineral density (BMD) in the ankle bones. The purpose of the present study was to evaluate the spatial distribution of BMD with use of weight-bearing cone-beam computed tomography (WBCT). Our hypothesis was that BMD distribution would be even in normal hindfeet, increased medially in varus hindfeet, and increased laterally in valgus hindfeet. Methods: In this study, 27 normally aligned hindfeet were retrospectively compared with 27 valgus and 27 varus-aligned hindfeet. Age (p = 0.967), body mass index (p = 0.669), sex (p = 0.820), and side (p = 0.708) were similar in the 3 groups. Hindfoot alignment was quantified on the basis of WBCT data sets with use of multiple measurements. BMD was calculated with use of the mean Hounsfield unit (HU) value as a surrogate. The HU medial-to-lateral ratio (HUR), calculated from tibial and talar medial and lateral half-volumes, was the primary outcome of the study. Results: The 3 groups significantly differed (p < 0.001) in terms of tibial HUR (median, 0.91 [interquartile range (IQR), 0.75 to 0.98] in valgus hindfeet, 1 [IQR, 0.94 to 1.05] in normal hindfeet, and 1.04 [IQR, 0.99 to 1.1] in varus hindfeet) and talar HUR (0.74 [IQR, 0.50 to 0.80] in valgus hindfeet, 0.82 [IQR, 0.76 to 0.87] in normal hindfeet, and 0.92 [IQR, 0.86 to 1.05] in varus hindfeet). Linear regression showed that all hindfoot measurements significantly correlated with tibial and talar HUR (p < 0.001 for all). The mean HU values for normally-aligned hindfeet were 495.2 ± 110 (medial tibia), 495.6 ± 108.1 (lateral tibia), 368.9 ± 80.3 (medial talus), 448.2 ± 90.6 (lateral talus), and 686.7 ± 120.4 (fibula). The mean HU value for each compartment was not significantly different across groups. Conclusions: Hindfoot alignment and medial-to-lateral BMD distribution were correlated. In varus hindfeet, an increased HU medial-to-lateral ratio was consistent with a greater medial bone density in the tibia and talus as compared with the lateral parts of these bones. In valgus hindfeet, a decreased ratio suggested greater bone density in the lateral as compared with the medial parts of both the tibia and the talus. Level of Evidence: Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence.

show abstract

Section: Discussionmentioning

confidence: 99%

Ankle Joint Bone Density Distribution Correlates with Overall 3-Dimensional Foot and Ankle Alignment

Lintz,

Bernasconi,

Buedts

et al. 2023

Journal of Bone and Joint Surgery

View full text Add to dashboard Cite

show abstract

“…Despite these efforts, the correlation between CBCT's Greyscale values (GVs) and CT numbers remains challenging 12 . Recently, advances in machine learning 20,21 and dual-energy CBCT [22][23][24] have shown promise in improving accuracy. Our recent work introduces a multisource CBCT (ms-CBCT) technology [25][26][27] , which addresses the key limitations of conventional CBCT by employing a stack of narrowly collimated X-ray beams instead of a single X-ray tube.…”

Section: Introductionmentioning

confidence: 99%

Improving the accuracy of bone mineral density using a multisource CBCT

Hu,

Xu,

et al. 2024

Medical Imaging 2024: Physics of Medical Imaging

View full text Add to dashboard Cite

Because of the inherent limitations, conventional cone beam computed tomography (CBCT) systems are inaccurate in quantifying bone mineral density (BMD). A multisource CBCT (ms-CBCT) was recently developed. The aim of this study was to evaluate the accuracy of the ms-CBCT system in estimating the BMD of mandibular and maxillary bones and to compare it with the conventional CBCT, utilizing a multi-detector CT (MDCT) as a reference standard. For this purpose, an anthropomorphic adult skull and tissue equivalent head phantom, along with a homemade calibration phantom containing inserts of calcium hydroxyapatite of varied densities, were imaged. The phantoms were imaged using the ms-CBCT, the ms-CBCT operating in the conventional CBCT mode using one source, two clinical dental CBCT scanners, and an MDCT, under similar imaging doses. The images were reconstructed, registered and segmented. The scanner-specific calibration curves were utilized to establish a relation to convert the measured CT Hounsfield Unit (HU) and Greyscale Value (GV) at multiple region-of-interests to the BMD. Statistical analysis showed that a significant enhancement in the accuracy of the HU and BMD values derived from the ms-CBCT as compared to the conventional clinical dental CBCT. These findings suggest that the ms-CBCT system may serve as a reliable and lower-dose alternative for precise BMD quantification.

show abstract

“…Standard CBCT scanners use polychromatic x-ray beam with one broad energy spectrum. Dual energy CBCT (DE-CBCT) has been shown to provide more accurate Hounsfield Unit (HU) and bone mineral density values and reduced metal artifacts in synthesized virtual monoenergetic images [3][4][5]. However, DE-CBCT has not been widely implemented clinically, partially due to the increased equipment cost.…”

Section: Introductionmentioning

confidence: 99%

Dual-energy CBCT by spectral filtration of a dual-focus CNT x-ray source

Li,

Hu,

Inscoe

et al. 2024

Medical Imaging 2024: Physics of Medical Imaging

View full text Add to dashboard Cite

Dual-energy CBCT acquires projection images using two different x-ray spectra, enabling material quantification and synthesis of virtual monoenergetic images to reduce metal artifacts. Current methods for dual-energy CBCT imaging include using either a fast kVp switching x-ray source or a dual-layer detector. In this work, we demonstrate a novel approach to dual-energy CBCT by spectral filtration of an x-ray source that contains two focal spots. The method generates two distinct x-ray spectra and independently programmable dose and dose rate for the two energies, without a significant cost increase over a conventional CBCT. Two spectral filters were attached to the x-ray exit windows of a dual-focus carbon nanotube x-ray source operating at a constant tube voltage. As the source and detector rotate around the object, alternating high and low energy projections were acquired by alternatively activating electron emission from the two cathodes. A one-step material decomposition based on separable quadratic surrogate functions was implemented. A water equivalent plastic phantom with calcium and iodine contrast inserts was imaged to evaluate the accuracy of material decomposition. Results demonstrate a functional low-cost dual-energy CBCT system by spectral filtration, with the accuracy for material quantification comparable to those from the dual-layer detector and fast kVp switching based DE-CBCT.

show abstract

A Comparative Study on the Voxel Values in Alveolar Bones Acquired by MDCT and Newly Developed Dental Dual-Energy CBCT

Cited by 6 publications

References 26 publications

Ankle Joint Bone Density Distribution Correlates with Overall 3-Dimensional Foot and Ankle Alignment

Ankle Joint Bone Density Distribution Correlates with Overall 3-Dimensional Foot and Ankle Alignment

Improving the accuracy of bone mineral density using a multisource CBCT

Dual-energy CBCT by spectral filtration of a dual-focus CNT x-ray source

Contact Info

Product

Resources

About