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Can Computerized hounsfield unit Estimation Be Used as Predictor for Ureteric Stone Localization by Fluoroscopy during Extra Corporal Shock Wave Lithotripsy and Ureteroscopy?

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Open Journal of Urology 2022年第9期12卷 449-458页

作者： Mohamed Izeldeen Ibrahim Ahmed Ibrahim Ahmed Department of Urology Prince Osman Digna Hospital Port Sudan Sudan Department of Urology National Rebat University Khartoum Sudan

Current minimally invasive interventions for ureteric stones involve either ESWL or Ureteroscopy and stone localization is mandatory for successful treatment in both. Objectives: To avoid doing KUB radiograph before ESWL routinely by correlating the stone attenuation value on CT KUB with stone visualization at fluoroscopy. Methods: This is a prospective cross sectional hospital based, Multicentric study carried out on 1010 patients with ureteric stones in Sudan from August 2014 to March 2016. Results: Mean stone density in HU was 704.45 ± 300 (SD) ranging (81 - 1873) HU. All of the stones were localized using fluoroscopy and only 26.5% of them were not seen under fluoroscopy. I.V contrast was used mostly, and also mainly in the upper ureter. More than 80% of the application of contrast through the ureteric catheter was in the lower ureteric stones. 91.2% of patients with stone density ≤ 400 HU failed to appear at fluoroscopy and therefore 400 HU attenuation value can be used as a cut-off level to request doing KUB before ESWL and Ureteroscopy. Conclusion: the ureteric stones with density ≤400 HU the likelihood of being non-visualized at fluoroscopy is 91.2% therefore if the stone has ≤400 HU at CT KUB it is mandatory to do KUB before treatment above that it is most likely to be seen at fluoroscopy and no need to request KUB for them before ESWL or URS. 1) Inclusion Criteria: All patients diagnosed by CT scan to have ureteric stones for ESWL or Ureteroscopy. 2) Exclusion Criteria: Patients for whom treatment of ureteric stone by ESWL or ureteroscopy is not indicated like severe infection or poor kidney function where nephrectomy is needed.

关键词： Ureteric Stones hounsfield unit Attenuation KUB CT KUB Cut off Level Visualization of Ureteric Stones ESWL Ureteroscopy

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hounsfield units in assessing bone mineral density in ankylosing spondylitis patients with cervical fracture-dislocation

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World Journal of Clinical Cases 2024年第23期12卷 5329-5337页

作者： Zhong-Ya Gao Wei-Lin Peng Yang Li Xu-Hua Lu Department of Orthopaedics Shanghai Changzheng HospitalNaval Medical UniversityShanghai 200003China

BACKGROUND Cervical spine fracture-dislocations in patients with ankylosing spondylitis(AS)are mostly unstable and require ***,osteoporosis,one of the comorbidities for AS,could lead to detrimental *** are few accurate assessments of bone mineral density in AS *** To analyze hounsfield units(HUs)for assessing bone mineral density in AS patients with cervical *** The HUs from C2 to C7 of 51 patients obtained from computed tomography(CT)scans and three-dimensional reconstruction of the cervical spine were independently assessed by two trained spinal surgeons and statistically ***-reader reliability and agreement were assessed by interclass correlation *** The HUs decreased gradually from C2 to *** mean values of the left and right levels were significantly higher than those in the *** the 51 patients,25 patients(49.02%)may be diagnosed with osteoporosis,and 16 patients(31.37%)may be diagnosed with *** The HUs obtained by cervical spine CT are feasible for assessing bone mineral density with excellent agreement in AS patients with cervical fracture-dislocation.

关键词： hounsfield unit Ankylosing spondylitis Fracture-dislocation Cervical spine Osteoporosis

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Complicated calcified alloplastic implants in the nasal dorsum:A clinical analysis

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World Journal of Clinical Cases 2024年第18期12卷 3351-3359页

作者： Yong-Seon Hwang Taek-Kyun Kim Dong-Jun Yang Si-Hyong Jang Da-Woon Lee Department of Plastic and Reconstructive Surgery College of MedicineSoonchunhyang UniversityCheonan-Si 31151South Korea Department of Plastic Surgery The PLUS Plastic Surgery ClinicSeoul 06035South Korea Department of Plastic Surgery CDU Plastic Surgery ClinicSeoul 06067South Korea Department of Pathology College of MedicineSoonchunhyang UniversityCheonan 31151Chungcheongnam-doSouth Korea

BACKGROUND In rhinoplasty,calcification around silicone implants is frequently observed in the tip dorsum(TD)***,based on a review of various literature,it is presumed that calcification in silicone implants occurs due to both inflammatory chemical reactions and physical friction against the *** calcification of nasal silicone implants not only results in the functional loss of the implants,but also leads to material ***,there is a lack of research on calcification of nasal silicone implants in the current *** To elucidate various clinical characteristics of calcification around nasal silicone implants,using histological and radiological *** This study analyzed data from 16 patients of calcified nasal implants,who underwent revision rhinoplasty for various reasons after undergoing augmentation rhinoplasty with silicone *** collected data included information on implant duration,implant types,location of calcification,presence of inflammatory reactions,and computed tomography(CT)*** The most common location of calcification,as visually analyzed,was in the TD area,accounting for 56%.Additionally,the analysis of CT scans revealed a trend of increasing hounsfield unit values for calcification with the duration of implantation,although this trend was not statistically significant(P=0.139).CONCLUSION Our study shows that reducing the frequency of calcification may be achievable by using softer silicone implants and by minimizing the damage to perioperative tissues.

关键词： Silicone implants Rhinoplasty Calcification Complication hounsfield unit

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Clinical features and literature review related to the material differences in thread rhinoplasty:Two case reports

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World Journal of Clinical Cases 2021年第31期9卷 9635-9644页

作者： Da Woon Lee Heongrae Ryu Si-Hyong Jang Jun Hyuk Kim Department of Plastic and Reconstructive Surgery College of MedicineSoonchunhyang UniversityCheonan 31151Chungcheongnam-doSouth Korea Department of Pathology College of MedicineSoonchunhyang UniversityCheonan 31151Chungcheongnam-doSouth Korea

BACKGROUND Thread rhinoplasty can trigger a reaction to thread material,which is a foreign *** compared clinical features induced by absorbable and non-absorbable threads following thread *** SUMMARY Two patients who underwent different thread materials showed different clinical courses and different hounsfield unit(HU)values in computed *** with absorbable thread showed high HU values similar to a metallic material,and the HU value of inflammation was similar to vascular tissues with a lot of water(250).In the intraoperative field,absorbable thread materials and micro-abscesses were *** contrast,in the case of a non-absorbable thread,an object presumed to be thread was seen on the computed tomography(CT),and the HU value of inflammatory tissues was less than *** both patients,post-operative HU decreased to less than 100 and the clinical course *** both cases,histopathologic findings revealed foreign body granuloma associated with *** Absorbable threads were more aggressive and are more easily detected on CT.

关键词： Thread rhinoplasty Polydioxanone Polyprophylene hounsfield unit Computed tomography

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上尿路结石CT值及体积对钬激光碎石效率的临床效果评价研究

上尿路结石CT值及体积对钬激光碎石效率的临床效果评价研究

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作者：王志伟南昌大学

学位级别：硕士

目的:探讨输尿管软镜钬激光碎石治疗上尿路结石的临床效果评价,对于上尿路结石的相关因素与输尿管软镜钬激光碎石效率存在的关系,目前暂无明确的研究。对此我们研究了经非增强CT检查测算上尿路结石体积大小和结石的平均CT值及手术时间... 详细信息

目的:探讨输尿管软镜钬激光碎石治疗上尿路结石的临床效果评价,对于上尿路结石的相关因素与输尿管软镜钬激光碎石效率存在的关系,目前暂无明确的研究。对此我们研究了经非增强CT检查测算上尿路结石体积大小和结石的平均CT值及手术时间在钬激光碎石效率的临床效果评价。方法:回顾性分析2022年1月至2022年12月在南昌大学第二附属医院泌尿外科88例行输尿管软镜钬激光碎石手术,所有的病人行术前非增强CT检查获得获得了上尿路结石的大小和平均CT值。结石体积(mm )采用欧洲泌尿外科协会的推荐的椭球体公式。手术效率为结石体积除以手术时间。评估结石平均CT值、结石体积、手术时间和手术效率之间的关系。术后1个月内通过影像学检查了解结石清除率。结果:通过低CT值A组(≤1000)及高CT值B组(>1000)的对照分析,高CT值(B组)与低CT值(A组)在结石体积存在统计学差异(P0.05),结论:结石体积及结石平均CT值是评估输尿管软镜钬激光碎石术效果的重要因素,有利于临床医师术前及术中指导。

关键词：平均CT值钬激光输尿管软镜碎石术 hounsfield unit 碎石效率

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CT值与老年髋部骨折的相关性研究

CT值与老年髋部骨折的相关性研究

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作者：周愉林川北医学院

学位级别：硕士

目的:通过测量脊柱、髋部的CT值并分析其与骨密度T值的相关性,间接评估髋部骨密度水平。为临床上筛查髋部骨折发生的高风险人群,提高髋部骨折风险性预测准确性,尽早防范提供数据和理论基础。材料和方法:本研究纳入的患者均接受普通CT扫... 详细信息

目的:通过测量脊柱、髋部的CT值并分析其与骨密度T值的相关性,间接评估髋部骨密度水平。为临床上筛查髋部骨折发生的高风险人群,提高髋部骨折风险性预测准确性,尽早防范提供数据和理论基础。材料和方法:本研究纳入的患者均接受普通CT扫描及髋部DXA检查,分为髋部骨折组以及无骨折对照组。由一名医师在两组患者CT图像上手动画出感兴趣区域(ROI),计算出CT值。运用组内相关系数(intraclass correlation efficient,ICC)评估医师的复测信度,将 ICC>0.75纳入分析,使用Pearson相关系数评估不同部位CT值和髋部骨密度T值相关性。使用受试者工作特征曲线(ROC)和曲线下面积(AUC)评估CT值预测髋部骨折的能力,评估其预测敏感度、特异度,并计算诊断截断值。结果:1、本研究共纳入了 164例患者,其中髋部骨折组80例,对照组84例,两组人群身高、体重、BMI、吸烟、饮酒均无统计学差异。2、CT值各自三次重复测量数值之间呈高度相关性。3、L1、股骨头、股骨颈值测定结果:骨折组L1、股骨头、股骨颈CT 值比对照组明显减少(117.4±26.1 vs.171.0±29.7;192.3±37.6 vs.272.1±52.1;110.9±21.6vs.167.6±30.9)。骨折组髋部骨密度 T 值较对照组同样明显减少(-2.2±0.43 vs.-1.5±0.48,P<0.001)。L1(r=0.848,P<0.0001)、股骨头(r=0.936,P<0.0001)、股骨颈(r=0.869,P<0.0001)CT值与髋部骨密度T值具有显著相关性。4、L1 CT值预测髋部骨折ROC曲线的AUC为0.906,敏感度为0.738,特异度为0.938,截断值为156 HU;股骨头CT值预测髋部骨折ROC曲线的AUC为0.889,敏感度为0.725,特异度为0.938,截断值为264 HU;股骨颈CT值预测髋部骨折ROC曲线的AUC为0.936,敏感度为0.940,特异度为0.875,截断值为123 HU。骨密度T值预测髋部骨折ROC曲线的AUC为0.864,敏感度为0.702,特异度为0.875,截断值为-1.8。结论:1.本研究通过对L1椎体、股骨颈及股骨头松质骨CT值与髋部骨密度T值进行分析,结果提示二者具有正相关性,CT值随着T值增加而增加,CT值测量可以间接反应骨密度水平。2.通过对比老年髋部骨折组与对照组CT值,老年髋部骨折组CT值明显低于对照组,CT值预测髋部骨折具有良好的敏感度及特异度。

关键词：髋部骨折 CT值 hounsfield unit 骨密度

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东亚江豚额隆波束调控效应研究

东亚江豚额隆波束调控效应研究

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2016年全国声学学术会议

作者：宋忠长张宇王先艳魏翀厦门大学水声通信与海洋信息技术教育部重点实验室国家海洋局第三海洋研究所

本文通过CT扫描实验,获得了东亚江豚头部内部的细微结构,并通过切片实验测量了该江豚前额区域不同位置组织的声速和密度值。并对获取得到的组织切片的CT扫描结果亨氏单位hounsfield unit（HU）与切片对应的声速、密度进行冋归分析,结果... 详细信息

本文通过CT扫描实验,获得了东亚江豚头部内部的细微结构,并通过切片实验测量了该江豚前额区域不同位置组织的声速和密度值。并对获取得到的组织切片的CT扫描结果亨氏单位hounsfield unit（HU）与切片对应的声速、密度进行冋归分析,结果显示声速、密度与HU值之间具有显著线性关系,并由此重建该江豚头部的声速、密度分布。并根据CT扫描结果构建了该江豚的头部二维模型,将重建得到的声速、密度分布用于二维模型中,利用有限元方法研究了该江豚的声波波束特点与额隆在波束形成过程中起到的调控作用。

关键词：江豚有限元 hounsfield unit 额隆

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