ISRN radiology最新文献_第4页

Directable needle guide: efficacy for image-guided percutaneous interventions. 可定向导针:图像引导下经皮介入治疗的疗效。

ISRN radiology Pub Date : 2012-11-27 eCollection Date: 2013-01-01 DOI: 10.5402/2013/516941

Hiroshi Ishizaka

引用次数: 1

Scan Quality and Entrance Skin Dose in Thoracic CT: A Comparison between Bismuth Breast Shield and Posteriorly Centered Partial CT Scans. 胸部CT的扫描质量和入口皮肤剂量:铋胸屏蔽和后中心部分CT扫描的比较。

ISRN radiology Pub Date : 2012-11-26 eCollection Date: 2013-01-01 DOI: 10.5402/2013/457396

Rafel Tappouni, Bradley Mathers

{"title":"Scan Quality and Entrance Skin Dose in Thoracic CT: A Comparison between Bismuth Breast Shield and Posteriorly Centered Partial CT Scans.","authors":"Rafel Tappouni, Bradley Mathers","doi":"10.5402/2013/457396","DOIUrl":"https://doi.org/10.5402/2013/457396","url":null,"abstract":"Objectives. To compare the effectiveness of the bismuth breast shield and partial CT scan in reducing entrance skin dose and to evaluate the effect of the breast shield on image quality (IQ). Methods. Nanodots were placed on an adult anthropomorphic phantom. Standard chest CT, CT with shield, and partial CT were performed. Nanodot readings and effective doses were recorded. 50 patients with chest CTs obtained both with and without breast shields were reviewed. IQ was evaluated by two radiologists and by measuring Hounsfield units (HUs) and standard deviation (SD) of HU in anterior subcutaneous region. Results. Breast shield and the partial CT scans reduced radiation to the anterior chest by 38% and 16%, respectively. Partial CT increased dose to the posterior chest by 37% and effective dose by 8%. Change in IQ in shield CT was observed in the anterior chest wall. Significant change in IQ was observed in 5/50 cases. The shield caused an increase of 20 HU (P = 0.021) and a 1.86 reduction in SD of HU (P = 0.027) in the anterior compared to posterior subcutaneous regions. Summary. Bismuth breast shield is more effective than the partial CT in reducing entrance skin dose while maintaining image quality. ","PeriodicalId":90195,"journal":{"name":"ISRN radiology","volume":"2013 ","pages":"457396"},"PeriodicalIF":0.0,"publicationDate":"2012-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4045517/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32458240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 23

The Role of ECG-Gated CT in Patients with Bicuspid Aortic Valve Replacement: New Perspectives in Short- and Long-Term Followup. 心电图门控CT在二尖瓣主动脉瓣置换术中的作用:短期和长期随访的新视角。

ISRN radiology Pub Date : 2012-10-23 eCollection Date: 2013-01-01 DOI: 10.5402/2013/826073

Massimiliano Sperandio, Chiara Arganini, Alessio Bindi, Armando Fusco, Carlo Olevano, Fabio Bertoldo, Andrea Romagnoli, Luigi Chiariello, Giovanni Simonetti

{"title":"The Role of ECG-Gated CT in Patients with Bicuspid Aortic Valve Replacement: New Perspectives in Short- and Long-Term Followup.","authors":"Massimiliano Sperandio, Chiara Arganini, Alessio Bindi, Armando Fusco, Carlo Olevano, Fabio Bertoldo, Andrea Romagnoli, Luigi Chiariello, Giovanni Simonetti","doi":"10.5402/2013/826073","DOIUrl":"https://doi.org/10.5402/2013/826073","url":null,"abstract":"The aim of our study was to compare the results of the TTE (transthoracic echocardiography) with the results obtained by the ECG-gated 64 slices CT during the followup of patients with bicuspid aortic valve (BAV), after aortic valve replacement; in particular we evaluated the aortic root and the ascending aorta looking for a new algorithm in the followup of these patients. From January 1999 to December 2009 our attention was focused on 67 patients with isolated surgical substitution of aortic valve; after dismissal they were strictly observed. During the period between May and September 2010, these patients underwent their last evaluation, and clinical exams, ECG, TTE, and an ECG-gated-MDCT were performed. At followup TTE results showed an aortic root of 36.7 ± 4 mm and an ascending aorta of 39.6 ± 4.8 mm. ECG- gated CT showed an aortic root of 37.9 ± 5.5 mm and an ascending aorta of 43.1 ± 5.2. The comparison between preoperative and postoperative TTE shows a significant long-term dilatation of the ascending aorta while the aortic root diameter seems to be stable. ECG-gated CT confirms the stability of the aortic root diameter (38.2 ± 5.3 mm versus 37.9 ± 5.5 mm; <0.0001) and the increasing diameter value of the ascending aorta (40.2 ± 3.9 mm versus 43.1 ± 5.2 mm; P = 0.0156). Due to the different findings between CT and TTE studies, ECG-gated CT should no longer be considered as a complementary exam in the followup of patients with BAV, but as a fundamental role since it is a real necessity. ","PeriodicalId":90195,"journal":{"name":"ISRN radiology","volume":"2013 ","pages":"826073"},"PeriodicalIF":0.0,"publicationDate":"2012-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4045515/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32458244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Volumetric breast ultrasound as a screening modality in mammographically dense breasts. 乳腺体积超声作为乳腺造影致密性乳房的筛查方式。

ISRN radiology Pub Date : 2012-10-23 eCollection Date: 2013-01-01 DOI: 10.5402/2013/235270

Vincenzo Giuliano, Concetta Giuliano

引用次数: 3

Early diagnosis of gallbladder carcinoma: an algorithm approach. 胆囊癌早期诊断的一种算法方法。

ISRN radiology Pub Date : 2012-10-18 eCollection Date: 2013-01-01 DOI: 10.5402/2013/239424

Abhishek Vijayakumar, Avinash Vijayakumar, Vijayraj Patil, M N Mallikarjuna, B S Shivaswamy

引用次数: 42

Assessment of Myocardial Contractile Function Using Global and Segmental Circumferential Strain following Intracoronary Stem Cell Infusion after Myocardial Infarction: MRI Feature Tracking Feasibility Study. 心肌梗死后冠状动脉内干细胞输注后用整体和节段周向应变评估心肌收缩功能:MRI特征跟踪可行性研究。

ISRN radiology Pub Date : 2012-09-29 eCollection Date: 2013-01-01 DOI: 10.5402/2013/371028

Sabha Bhatti, Hussein Al-Khalidi, Kan Hor, Abdul Hakeem, Michael Taylor, Arshed A Quyyumi, John Oshinski, Andrew L Pecora, Dean Kereiakes, Eugene Chung, Gianni Pedrizzetti, Tomasz Miszalski-Jamka, Wojciech Mazur

{"title":"Assessment of Myocardial Contractile Function Using Global and Segmental Circumferential Strain following Intracoronary Stem Cell Infusion after Myocardial Infarction: MRI Feature Tracking Feasibility Study.","authors":"Sabha Bhatti, Hussein Al-Khalidi, Kan Hor, Abdul Hakeem, Michael Taylor, Arshed A Quyyumi, John Oshinski, Andrew L Pecora, Dean Kereiakes, Eugene Chung, Gianni Pedrizzetti, Tomasz Miszalski-Jamka, Wojciech Mazur","doi":"10.5402/2013/371028","DOIUrl":"https://doi.org/10.5402/2013/371028","url":null,"abstract":"Background. Magnetic resonance imaging (MRI) strain analysis is a sensitive method to assess myocardial function. Our objective was to define the feasibility of MRI circumferential strain (ε cc) analysis in assessing subtle changes in myocardial function following stem cell therapy. Methods and Results. Patients in the Amorcyte Phase I trial were randomly assigned to treatment with either autologous bone-marrow-derived stem cells infused into the infarct-related artery 5 to 11 days following primary PCI or control. MRI studies were obtained at baseline, 3, and 6 months. ε cc was measured in the short axis views at the base, mid and apical slices of the left ventricle (LV) for each patient (13 treatments and 10 controls). Mid-anterior LV ε cc improved between baseline -18.5 ± 8.6 and 3 months -22.6 ± 7.0, P = 0.03. There were no significant changes in ε cc at 3 months and 6 months compared to baseline for other segments. There was excellent intraobserver and interobserver agreement for basal and mid circumferential strain. Conclusion. MRI segmental strain analysis is feasible in assessment of regional myocardial function following cell therapy with excellent intra- and inter-observer variability's. Using this method, a modest interval change in segmental ε cc was detected in treatment group. ","PeriodicalId":90195,"journal":{"name":"ISRN radiology","volume":"2013 ","pages":"371028"},"PeriodicalIF":0.0,"publicationDate":"2012-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4045523/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32448696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Foetal radiation dose and risk from diagnostic radiology procedures: a multinational study. 放射诊断程序的胎儿辐射剂量和风险：一项跨国研究。

ISRN radiology Pub Date : 2012-09-25 eCollection Date: 2013-01-01 DOI: 10.5402/2013/318425

Ernest K Osei, Johnson Darko

{"title":"Foetal radiation dose and risk from diagnostic radiology procedures: a multinational study.","authors":"Ernest K Osei, Johnson Darko","doi":"10.5402/2013/318425","DOIUrl":"10.5402/2013/318425","url":null,"abstract":"In diagnostic radiology examinations there is a benefit that the patient derives from the resulting diagnosis. Given that so many examinations are performed each year, it is inevitable that there will be occasions when an examination(s) may be inadvertently performed on pregnant patients or occasionally it may become clinically necessary to perform an examination(s) on a pregnant patient. In all these circumstances it is necessary to request an estimation of the foetal dose and risk. We initiated a study to investigate fetal doses from different countries. Exposure techniques on 367 foetuses from 414 examinations were collected and investigated. The FetDoseV4 program was used for all dose and risk estimations. The radiation doses received by the 367 foetuses ranges: <0.001-21.9 mGy depending on examination and technique. The associated probability of induced hereditary effect ranges: <1 in 200000000 (5 × 10(-9)) to 1 in 10000 (1 × 10(-4)) and the risk of childhood cancer ranges <1 in 12500000 (8 × 10(-8)) to 1 in 500 (2 × 10(-3)). The data indicates that foetal doses from properly conducted diagnostic radiology examinations will not result in any deterministic effect and a negligible risk of causing radiation induced hereditary effect in the descendants of the unborn child. ","PeriodicalId":90195,"journal":{"name":"ISRN radiology","volume":"2013 ","pages":"318425"},"PeriodicalIF":0.0,"publicationDate":"2012-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4045527/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32448695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hybrid SPECT/CT Imaging in the Evaluation of Coronary Stenosis: Role in Diabetic Patients. SPECT/CT混合成像在评估冠状动脉狭窄:在糖尿病患者中的作用。

ISRN radiology Pub Date : 2012-09-10 eCollection Date: 2013-01-01 DOI: 10.5402/2013/419737

Andrea Romagnoli, Orazio Schillaci, Chiara Arganini, Eleonora Gaspari, Aurora Ricci, Daniele Morosetti, Irene Coco, Sonia Crusco, Ferdinando Calabria, Massimiliano Sperandio, Giovanni Simonetti

{"title":"Hybrid SPECT/CT Imaging in the Evaluation of Coronary Stenosis: Role in Diabetic Patients.","authors":"Andrea Romagnoli, Orazio Schillaci, Chiara Arganini, Eleonora Gaspari, Aurora Ricci, Daniele Morosetti, Irene Coco, Sonia Crusco, Ferdinando Calabria, Massimiliano Sperandio, Giovanni Simonetti","doi":"10.5402/2013/419737","DOIUrl":"https://doi.org/10.5402/2013/419737","url":null,"abstract":"Purpose. Our purpose was to combine the results of the MDCT (multidetector computed tomography) morphological data and the SPECT (single-photon emission computed tomography) data using hybrid imaging to overcome the limits of the MDCT in the evaluation of coronary stenosis in diabetic patients with large amount of calcium in the coronary arteries. Method and Materials. 120 diabetic patients underwent MDCT examination and SPECT examination. We evaluated 324 coronary arteries. After the examinations, we merged CT and SPECT images. Results. CT evaluation: 52 (32.8%) coronaries with stenosis ≥ 50%, 228 (70.4%) with stenosis < 50%, and 44 (13.6%) with a doubtful evaluation. SPECT evaluation: 80 (24.7%) areas with hypoperfusion, 232 (71.6%) with normal perfusion, and 12 (3.7%) with a doubtful evaluation. Of 324 coronary arteries and corresponding areas, the hybrid SPECT/CT evaluation showed 92 (28.4%) areas with hypoperfusion, and 232 (71.6%) with normal perfusion. Conclusion. Hybrid CT/SPECT imaging could be useful in the detection of significant coronary stenosis in patients with large amount of coronary calcifications. ","PeriodicalId":90195,"journal":{"name":"ISRN radiology","volume":"2013 ","pages":"419737"},"PeriodicalIF":0.0,"publicationDate":"2012-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4045525/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32448697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A survey of organ equivalent and effective doses from diagnostic radiology procedures. 放射诊断程序的器官当量和有效剂量调查。

ISRN radiology Pub Date : 2012-09-06 eCollection Date: 2013-01-01 DOI: 10.5402/2013/204346

Ernest K Osei, Johnson Darko

{"title":"A survey of organ equivalent and effective doses from diagnostic radiology procedures.","authors":"Ernest K Osei, Johnson Darko","doi":"10.5402/2013/204346","DOIUrl":"10.5402/2013/204346","url":null,"abstract":"The quantification of radiation risks associated with radiological examinations has been a subject of interest with the increased use of X-rays. Effective dose, which is a risk-weighted measure of radiation to organs in the body associated with radiological examination, is considered a good indicator of radiological risk. We have therefore investigated patient effective doses from radiological examinations. Organ and effective doses were estimated for 94 patients who underwent computed tomography examinations and for 338 patients who had conventional radiography examinations. The OrgDose (version 2) program was used for the estimation of effective doses. The tube potential ranges: 57 kVp to 138 kVp depending on the examination and patient size. The entrance surface doses have a wide range even for the same examination: 0.44-10.31 mGy (abdomen) and 0.66-16.08 mGy (lumbar spine) and the corresponding effective dose ranges 0.025-0.77 mSv and 0.025-0.95 mSv respectively. Effective dose for adult abdomen-pelvic CT examinations ranges 5.4-19.8 mSv with a mean of 13.6 mSv and for pediatrics ranges 2.1-5.5 mSv with a mean of 2.7 mSv. The mean effective dose for adult chest and head CT examinations are 7.9 and 1.8 mSv respectively and for pediatrics are 1.7 and 1.1 mSv. ","PeriodicalId":90195,"journal":{"name":"ISRN radiology","volume":"2013 ","pages":"204346"},"PeriodicalIF":0.0,"publicationDate":"2012-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4045519/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"32464200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0