Journal of radiology and imaging最新文献

Massive localized lymphedema of the thigh: Pseudosarcoma of the morbidly obese 大腿局部淋巴水肿：病态肥胖的假肉瘤

Journal of radiology and imaging Pub Date : 2024-03-12 DOI: 10.14312/2399-8172.2024-1

Husain Zsm, Driweesh Asa

引用次数: 0

Further development of the preceding Gaussian-pencil-beam-model used for calculation of the in-water dose caused by clinical electron-beam irradiation 用于计算临床电子束辐照引起的水中剂量的先前高斯笔状束模型的进一步发展

Journal of radiology and imaging Pub Date : 2023-08-01 DOI: 10.14312/2399-8172.2023-1

I. A, Terashima S, K. S, Sutoh K, K. K, Hosokawa Y, M. M

{"title":"Further development of the preceding Gaussian-pencil-beam-model used for calculation of the in-water dose caused by clinical electron-beam irradiation","authors":"I. A, Terashima S, K. S, Sutoh K, K. K, Hosokawa Y, M. M","doi":"10.14312/2399-8172.2023-1","DOIUrl":"https://doi.org/10.14312/2399-8172.2023-1","url":null,"abstract":"Purposes: We perform further development for our previous Gaussian-pencil-beam-model used for calculating the electron dose in water under clinical electron-beam irradiation. The main purpose is to evaluate accurately the parallel beam depth-doses at deep depths beyond about the extrapolated range (Rp) under an infinite field. Methods: Sets of parallel beam depth-doses under an infinite field were reconstructed for beams of E=6, 12, and 18 MeV in light of the electron Monte Carlo (eMC) datasets reported by Wieslander and Knöös (2006), separating the datasets into the direct electron beam and direct-plus-indirect electron beam groups. The datasets at the deep depths were then reconstructed using each factor of R_scale^OAD. Results and conclusions: The following results were obtained by comparing the calculated datasets of depth dose (DD) and off-axis dose (OAD) with the eMC datasets: (i) The further revised Gaussian pencil beam model is of practical use without using complicated correction factors; and (ii) The DD and OAD datasets are yielded effectively over wide ranges of depths and off-axis distances.","PeriodicalId":73922,"journal":{"name":"Journal of radiology and imaging","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42625745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A revised Gaussian pencil beam model for calculation of the in-water dose caused by clinical electron-beam irradiation 用于计算临床电子束照射引起的水中剂量的修正高斯铅笔束模型

Journal of radiology and imaging Pub Date : 2022-12-01 DOI: 10.14312/2399-8172.2022-1

I. A, Terashima S, K. S, S. K., K. K, Hosokawa Y, M. M, Tabata T

{"title":"A revised Gaussian pencil beam model for calculation of the in-water dose caused by clinical electron-beam irradiation","authors":"I. A, Terashima S, K. S, S. K., K. K, Hosokawa Y, M. M, Tabata T","doi":"10.14312/2399-8172.2022-1","DOIUrl":"https://doi.org/10.14312/2399-8172.2022-1","url":null,"abstract":"Purposes: The dose in water caused by clinical electron-beam irradiation is mainly composed of the doses due to the direct electrons, the indirect electrons, and the contaminant X-rays. In this paper, an analytical method for 3-dimensional (3D) dose calculation in water for the direct electrons and for the direct-plus-indirect electrons is proposed in light of the electron Monte Carlo (eMC) datasets. Methods: The dose calculation was performed for square fields, based on a revised Gaussian pencil beam model, where the parallel beam depth-dose dataset under an infinitely large field was reconstructed from the depth-dose dataset of a fan beam with a finite field. We used a semi-infinite water phantom, setting the beam incident surface on the isocenter plane that is perpendicular to the beam axis. The dose calculation model sets an effective field at each dose calculation depth, where the effective field is larger than the geometrical field that the electron applicator forms on the basis of its divergent spread under the effective source-surface distance (SSDeff). Results and conclusions: By comparing the calculated datasets of depth dose (DD) and off-axis dose (OAD) in water with the eMC datasets for electron beams of E=6, 12, and 18 MeV by Wieslander and Knöös (2006), it has been found that the revised Gaussian pencil beam model is of practical use and has a bright prospect to give almost the same calculation results as the eMC datasets.","PeriodicalId":73922,"journal":{"name":"Journal of radiology and imaging","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47577622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Fast magnetic resonance arthrography of the labrum 快速关节唇核磁共振成像

Journal of radiology and imaging Pub Date : 2021-07-02 DOI: 10.14312/2399-8172.2021-3

English Cl, Shannon Fj, Bergin D

{"title":"Fast magnetic resonance arthrography of the labrum","authors":"English Cl, Shannon Fj, Bergin D","doi":"10.14312/2399-8172.2021-3","DOIUrl":"https://doi.org/10.14312/2399-8172.2021-3","url":null,"abstract":"Research question: Short volumetric interpolated breath hold exam (VIBE) 3D gradient echo sequences are comparable to T1 spin echo (SE) sequences for evaluating the shoulder labrum using arthroscopy as a gold standard. Methods: 24 patients with suspected labral tears had magnetic resonance (MR) arthrography of the shoulder using 1.5T MR scanner. Coronal oblique 3D VIBE FS sequences were performed and reconstructed in axial and sagittal oblique planes and compared with standard T1 SE sequences. Presence and location of labral tear and rotator cuff tears were noted. Findings were correlated with surgery where available. Time to obtain T1 SE sequences versus 3D VIBE acquisition was recorded. Results: Of 24 patients, 54% had arthroscopy. Sensitivity and positive predictive value (PPV) of both T1 SE and VIBE sequences for labral tears was 92%. 100% agreement for diagnosis of labral tear by readers between both sequences was noted. Specific labral tear location was accurate in 75% for both sequences. The mean time to obtain T1 SE sequences was 13.5 mins and 7.5 minutes for 3D VIBE sequences. Conclusion: Fast MR arthrography using 3D VIBE sequences shows excellent concordance with standard T1-FS sequence for diagnosis of labral tears. With shorter acquisition time and high diagnostic sensitivity 3D VIBE sequences maybe used as an alternative to standard sequences. Level of evidence: Level III retrospective diagnostic study.","PeriodicalId":73922,"journal":{"name":"Journal of radiology and imaging","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42898813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analytic continuation and incomplete data tomography. 解析延拓与不完全数据层析。

Journal of radiology and imaging Pub Date : 2021-03-01 Epub Date: 2021-03-04 DOI: 10.14312/2399-8172.2021-2

Gengsheng L Zeng, Ya Li

引用次数: 3

Scattered radiation during osteosynthesis of the distal radius: A phantom study 桡骨远端骨固定过程中的散射辐射:一项假体研究

Journal of radiology and imaging Pub Date : 2021-01-04 DOI: 10.14312/2399-8172.2021-1

Legerstee Iwf, Oosterveer Ttm, Molenaar Ma, Rasenberg Dwm, Spoon Eqw, Verhoeven Vwj, van der Velden Em

{"title":"Scattered radiation during osteosynthesis of the distal radius: A phantom study","authors":"Legerstee Iwf, Oosterveer Ttm, Molenaar Ma, Rasenberg Dwm, Spoon Eqw, Verhoeven Vwj, van der Velden Em","doi":"10.14312/2399-8172.2021-1","DOIUrl":"https://doi.org/10.14312/2399-8172.2021-1","url":null,"abstract":"Modern fracture surgery requires an increasing number of operative procedures utilising radiological control. During osteosyntheses patients receive scattered radiation when fluoroscopy is used. Unlike operating-room staff, patients are not protected during these procedures. The aim of this study was to measure the amount of scattered radiation in the phantom plane during a simulated osteosynthesis in order to evaluate the patient’s need for protection. A lower arm anthropomorphic phantom was irradiated with the use of a Philips BV Pulsera C-arm. The amounts of scattered radiation at distances from 10 to 160 cm and angles of 0 to 180 degrees in the phantom plane were measured with a real-time dosimeter. The same amount of measurements was repeated with a fixation plate on top of the phantom to simulate a fracture reduction operation. The maximum amount of scattered radiation was 1.63 µSv at a distance of 10 cm from the edge of the radiation beam. This phantom study shows that scattered radiation during osteosyntheses of the distal radius is negligible and therefore no patient protection is needed. The results should be interpreted carefully as this is a phantom study.","PeriodicalId":73922,"journal":{"name":"Journal of radiology and imaging","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44555484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fast filtered backprojection algorithm for low-dose computed tomography. 低剂量计算机断层扫描的快速滤波反投影算法。

Journal of radiology and imaging Pub Date : 2020-12-01 Epub Date: 2020-11-30 DOI: 10.14312/2399-8172.2020-7

Gengsheng L Zeng

引用次数: 0

Iterative versus non-iterative image reconstruction methods for sparse magnetic resonance imaging. 稀疏磁共振成像的迭代与非迭代图像重建方法。

Journal of radiology and imaging Pub Date : 2020-08-01 DOI: 10.14312/2399-8172.2020-5

Gengsheng L Zeng, Edward V DiBella

引用次数: 1

Lack of clinically meaningful anatomical variations in bone marrow apparent diffusion coefficient in diffuse pattern myeloma allows untargeted sampling to confirm disease burden 弥漫性骨髓瘤中骨髓表观扩散系数缺乏临床意义的解剖变化，允许非靶向取样来确认疾病负担

Journal of radiology and imaging Pub Date : 2020-07-01 DOI: 10.14312/2399-8172.2020-4

K. A., O’Connor S, Boyd K, K. M, Blackledge M, Koh Dm, Messiou C

{"title":"Lack of clinically meaningful anatomical variations in bone marrow apparent diffusion coefficient in diffuse pattern myeloma allows untargeted sampling to confirm disease burden","authors":"K. A., O’Connor S, Boyd K, K. M, Blackledge M, Koh Dm, Messiou C","doi":"10.14312/2399-8172.2020-4","DOIUrl":"https://doi.org/10.14312/2399-8172.2020-4","url":null,"abstract":"Posterior iliac crest trephine may result in sampling error and incorrect measures of disease burden in patients with multiple myeloma. This may influence the decision to treat. To compare the regional apparent diffusion coefficient of bone marrow in patients with multiple myeloma without focal bone lesions and their correlation with indices of disease burden, whole-body diffusion weighted imaging of 48 patients with diffuse myeloma were retrospectively reviewed. Three regions of interest were drawn over four anatomical sites on apparent diffusion coefficient maps and average values recorded. Apparent diffusion coefficient values were compared using the Wilcoxon signed-rank test with p-value < 0.0125 (Bonferroni correction) taken as statistical significance. Average apparent diffusion coefficient values were correlated with age-adjusted marrow cellularity and plasma cell proportion at histopathology, and international staging system scores. There was no significant difference in the apparent diffusion coefficient of bone marrow in the left ilium (754 × 10 -6 mm 2 /s), right ilium (733 × 10 -6 mm 2 /s) and T6 (701 × 10 -6 mm 2 /s) but it was significantly lower in L3 (636 × 10 -6 mm 2 /s) (p-value < 0.0125). However, the variance of apparent diffusion coefficient across all sites were within limits of measurement repeatability (15%). No correlation was found between per-patient average apparent diffusion coefficient with age-adjusted marrow cellularity (p=0.7), proportion of plasma cells (p=0.2) or ISS scores (p=0.5). There was no clinically meaningful difference in apparent diffusion coefficient values across anatomical sites in diffuse myeloma. Untargeted bone marrow biopsy is likely to be representative in this patient group.","PeriodicalId":73922,"journal":{"name":"Journal of radiology and imaging","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42353053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Whole-body magnetic resonance imaging for detection of malignant disease: A head-to-head-comparison with whole-body 18F-FDG-PET/CT as the reference standard 全身磁共振成像检测恶性疾病:与全身18F-FDG-PET/CT作为参考标准的头部对比

Journal of radiology and imaging Pub Date : 2020-04-02 DOI: 10.14312/2399-8172.2020-3

Brix L, Ejlersen Ja, Fledelius J, Makieva I, Thylin Esg, Hansen J, Ha Lk, Gerke O, Isaksen C

{"title":"Whole-body magnetic resonance imaging for detection of malignant disease: A head-to-head-comparison with whole-body 18F-FDG-PET/CT as the reference standard","authors":"Brix L, Ejlersen Ja, Fledelius J, Makieva I, Thylin Esg, Hansen J, Ha Lk, Gerke O, Isaksen C","doi":"10.14312/2399-8172.2020-3","DOIUrl":"https://doi.org/10.14312/2399-8172.2020-3","url":null,"abstract":"Introduction: The combined use of 18 F-FDG-PET and computed tomography (CT) scans is an integrated part of diagnosing and staging patients with suspected malignancy or other pathologies. Magnetic resonance imaging (MRI) has proven its use as a non-ionizing imaging alternative for identifying potential malignancy in specific organs. Objective: To investigate the clinical value of whole-body MRI in detection of suspicious lesions, we compared 1.5T MRI findings to those obtained from a whole-body 18 F-FDG-PET/CT scan, the latter serving as the reference standard. Finally, the findings were compared with histology if available. Materials and methods: Twenty-five patients (9 women and 16 men, mean age ± SD: 64.5 ± 11.8 years; range: 34±85 years) with suspected malignancy or other pathologies were enrolled. All patients were scanned using both modalities. Imaging included the head, torso and extremities. Images were scored blinded by experienced readers: two radiologists and two nuclear medicine physicians. Statistical tests included weighted kappa for measuring interobserver reliability and Wilcoxon signed-rank test for detection differences between paired observations. Results and discussion: Interobserver reliability between each pair of specialists was fair-to-strong (Weighted kappa). Statistically significant differences between the findings of the two modalities were found in the colon (p=0.016), soft tissues of the extremities (p=0.002) and skeleton of the extremities (p=0.008). Twelve patients had histology available. WB-MRI and whole-body 18 F-FDG-PET/CT found 10 of these cases (sensitivity: 83.3%, 95% CI: 55.2%-95.3%). Conclusion: The diagnostic value of WB-MRI equaled whole-body 18 F-FDG-PET/CT. The MRI approach could therefore be considered in patients unsuitable for 18 F-FDG-imaging e.g. younger patients, during pregnancy or dysregulated diabetics.","PeriodicalId":73922,"journal":{"name":"Journal of radiology and imaging","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42623690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0