Improving Hounsfield Unit accuracy in dental CBCT through the integration of 2D anti-scatter grid.

IF 1.6 3区医学 Q3 DENTISTRY, ORAL SURGERY & MEDICINE

Oral Radiology Pub Date : 2025-05-16 DOI:10.1007/s11282-025-00824-3

Ryan Sabounchi, Uttam Pyakurel, Farhang Bayat, Mohamed Eldib, Bahadir Ozus, Benjamin Crockett, Cem Altunbas

{"title":"Improving Hounsfield Unit accuracy in dental CBCT through the integration of 2D anti-scatter grid.","authors":"Ryan Sabounchi, Uttam Pyakurel, Farhang Bayat, Mohamed Eldib, Bahadir Ozus, Benjamin Crockett, Cem Altunbas","doi":"10.1007/s11282-025-00824-3","DOIUrl":null,"url":null,"abstract":"Objective: Lack of Hounsfield Unit (HU) accuracy leads to misrepresentation of tissue densities and causes image artifacts in dental cone beam computed tomography (CBCT) images. This work investigates the improvement in HU accuracy in dental CBCT by suppressing scatter with a novel two-dimensional anti-scatter grid (2D ASG) approach.Methods: A 2D ASG prototype was developed and integrated into an experimental CBCT system, emulating dental CBCT geometry. CBCT scans were acquired using a multidetector CT (MDCT), a clinical dental CBCT, and the proposed 2D ASG-based experimental CBCT system. Subsequently, HU accuracy, nonuniformity, and contrast-to-noise ratio (CNR) were evaluated in image quality phantoms benchmarked against MDCT images. The effect of scatter suppression on the implant-induced HU degradation was also studied.Results: 2D ASG reduced scatter content up to a factor of 6.6 in CBCT scans and HU nonuniformity in soft tissue-like regions was reduced from 23 to 4 HU. HU errors in high-density structures were within 65 HU of values measured in the gold standard MDCT images. Robust scatter suppression also reduced streak artifacts caused by implants. CNR increased up to 47% in images acquired with the 2D ASG.Conclusion: HU accuracy in dental CBCT may reach the accuracy of MDCT with the proposed 2D ASG. Moreover, artifacts are reduced, and contrast visualization can be improved. Hence, this approach may enable a more accurate assessment of tissue densities in CBCT images, and improved image quality may positively impact the diagnostic capabilities of dental CBCT systems.","PeriodicalId":56103,"journal":{"name":"Oral Radiology","volume":" ","pages":""},"PeriodicalIF":1.6000,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Oral Radiology","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1007/s11282-025-00824-3","RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"DENTISTRY, ORAL SURGERY & MEDICINE","Score":null,"Total":0}

引用次数: 0

Abstract

Objective: Lack of Hounsfield Unit (HU) accuracy leads to misrepresentation of tissue densities and causes image artifacts in dental cone beam computed tomography (CBCT) images. This work investigates the improvement in HU accuracy in dental CBCT by suppressing scatter with a novel two-dimensional anti-scatter grid (2D ASG) approach.

Methods: A 2D ASG prototype was developed and integrated into an experimental CBCT system, emulating dental CBCT geometry. CBCT scans were acquired using a multidetector CT (MDCT), a clinical dental CBCT, and the proposed 2D ASG-based experimental CBCT system. Subsequently, HU accuracy, nonuniformity, and contrast-to-noise ratio (CNR) were evaluated in image quality phantoms benchmarked against MDCT images. The effect of scatter suppression on the implant-induced HU degradation was also studied.

Results: 2D ASG reduced scatter content up to a factor of 6.6 in CBCT scans and HU nonuniformity in soft tissue-like regions was reduced from 23 to 4 HU. HU errors in high-density structures were within 65 HU of values measured in the gold standard MDCT images. Robust scatter suppression also reduced streak artifacts caused by implants. CNR increased up to 47% in images acquired with the 2D ASG.

Conclusion: HU accuracy in dental CBCT may reach the accuracy of MDCT with the proposed 2D ASG. Moreover, artifacts are reduced, and contrast visualization can be improved. Hence, this approach may enable a more accurate assessment of tissue densities in CBCT images, and improved image quality may positively impact the diagnostic capabilities of dental CBCT systems.

查看原文本刊更多论文

通过二维反散射网格集成提高牙科CBCT的Hounsfield单元精度。

目的：在牙锥束计算机断层扫描（CBCT）图像中，缺乏霍斯菲尔德单位（Hounsfield Unit， HU）的准确性会导致组织密度的错误呈现和图像伪影。本研究通过一种新的二维反散射网格（2D ASG）方法抑制散射，研究了牙科CBCT中HU精度的提高。方法：开发2D ASG原型，并将其集成到实验CBCT系统中，模拟牙科CBCT的几何形状。CBCT扫描使用多探测器CT （MDCT）、临床牙科CBCT和基于asg的2D实验CBCT系统获得。随后，在以MDCT图像为基准的图像质量幻象中，对HU精度、非均匀性和对比噪声比（CNR）进行了评估。研究了散射抑制对植入物诱导的HU降解的影响。结果：二维ASG在CBCT扫描中使散射含量降低了6.6倍，软组织样区域的HU不均匀性从23 HU降低到4 HU。高密度结构的HU误差在金标准MDCT图像测量值的65 HU以内。强大的散射抑制也减少了由植入物引起的条纹伪影。在2D ASG获得的图像中，CNR增加了47%。结论：采用所提出的2D ASG，牙科CBCT的HU精度可达到MDCT的精度。此外，减少了伪影，并且可以改进对比度可视化。因此，该方法可以更准确地评估CBCT图像中的组织密度，提高图像质量可能会对牙科CBCT系统的诊断能力产生积极影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Oral Radiology DENTISTRY, ORAL SURGERY & MEDICINE-

CiteScore

4.20

自引率

13.60%

发文量

审稿时长

>12 weeks

期刊介绍： As the official English-language journal of the Japanese Society for Oral and Maxillofacial Radiology and the Asian Academy of Oral and Maxillofacial Radiology, Oral Radiology is intended to be a forum for international collaboration in head and neck diagnostic imaging and all related fields. Oral Radiology features cutting-edge research papers, review articles, case reports, and technical notes from both the clinical and experimental fields. As membership in the Society is not a prerequisite, contributions are welcome from researchers and clinicians worldwide.