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https://www.readbyqxmd.com/read/28231555/edge-preserving-denoising-for-intra-operative-cone-beam-ct-in-endovascular-aneurysm-repair
#1
Yi Liu, Miguel Castro, Mathieu Lederlin, Huazhong Shu, Adrien Kaladji, Pascal Haigron
C-arm cone-beam computed tomography (CBCT) acquisition during endovascular aneurysm repair (EVAR) is an emergent technology with more and more applications. It offers real time imaging with a stationary patient and provides 3-D information to achieve guidance of intervention. However, there is growing concern on the overall radiation doses delivered to patients all along the endovascular management due to pre-, intra-, and post-operative X-ray imaging. Manufactures may have their low dose protocols to realize reduction of radiation dose, but CBCT with a low dose protocol has too many artifacts, particularly streak artifacts, and decreased contrast-to-noise ratio (CNR)...
January 30, 2017: Computerized Medical Imaging and Graphics: the Official Journal of the Computerized Medical Imaging Society
https://www.readbyqxmd.com/read/28230013/iodine-125-radioactive-seed-tissue-implantation-as-a-remedy-treatment-for-recurrent-cervical-cancer
#2
Lei Han, Changlun Li, Junye Wang, Xueqi He, Xiao Zhang, Jundong Yang, Guofeng Liu
PURPOSE: This study was designed to discuss feasibility, short-term efficacy, and complications of iodine-125 radioactive seed tissue implantation for remedying recurrent cervical cancer. MATERIALS AND METHODS: From June 2009 to December 2010, 17 patients with recurrent cervical cancer received radioactive seed implantation under computed tomography (CT) guidance. Matched peripheral dose was 145 Gy, while the number of implanted seeds was from 6 to 68 with a median of 20...
December 2016: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/28230010/dosimetry-study-of-three-dimensional-print-template-guided-precision-125-i-seed-implantation
#3
Zhang Hongtao, Di Xuemin, Yu Huimin, Wang Zeyang, Zhang Lijuan, Zhao Jinxin, Liu Zezhou, Sui Aixia, Wang Juan
OBJECTIVE: This study aimed to compare the dose difference in 125 I seed implantation between three-dimensional (3D) print template-guided operation and traditional implantation. MATERIALS AND METHODS: This study retrospectively analyzed 27 patients who underwent 125I seed implantation from August 2015 to December 2015 in Hebei General Hospital. Of these, 13 underwent seed implantation guided by a 3D print template, named the template group, and 14 underwent traditional implantation, named the traditional group...
December 2016: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/28228431/right-upper-quadrant-abdominal-pain-as-the-initial-presentation-of-polyarteritis-nodosa
#4
Ricardo Gago, Lee Ming Shum, Luis M Vilá
Polyarteritis nodosa (PAN) is a necrotising vasculitis that involves medium and small vessels. PAN generally presents with constitutional, cutaneous, neurological, renal and gastrointestinal manifestations. However, PAN initially involving a single organ/system is uncommon. Here, we present a 42-year-old man who was hospitalised because of severe right upper quadrant abdominal pain that started 2 months before. Physical examination was remarkable for right upper quadrant abdominal tenderness. Abdominopelvic CT showed lymphadenopathy but no hepatic, gallbladder, pancreatic, intestinal or renal abnormalities...
February 22, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28227381/graph-based-sinogram-denoising-for-tomographic-reconstructions
#5
Faisal Mahmood, Nauman Shahid, Pierre Vandergheynst, Ulf Skoglund, Faisal Mahmood, Nauman Shahid, Pierre Vandergheynst, Ulf Skoglund, Faisal Mahmood, Ulf Skoglund, Nauman Shahid, Pierre Vandergheynst
Limited data and low-dose constraints are common problems in a variety of tomographic reconstruction paradigms, leading to noisy and incomplete data. Over the past few years, sinogram denoising has become an essential preprocessing step for low-dose Computed Tomographic (CT) reconstructions. We propose a novel sinogram denoising algorithm inspired by signal processing on graphs. Graph-based methods often perform better than standard filtering operations since they can exploit the signal structure. This makes the sinogram an ideal candidate for graph based denoising since it generally has a piecewise smooth structure...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227378/fbp-initialized-few-view-ct-reconstruction-algorithm-using-similar-prior-image-constraint
#6
Weikang Zhang, Jiansen Li, Jianqi Sun, Jun Zhao, Weikang Zhang, Jiansen Li, Jianqi Sun, Jun Zhao, Jiansen Li, Weikang Zhang, Jun Zhao, Jianqi Sun
Few-view CT reconstruction attracts wide attention in the purpose of radiation dose reduction. For analytical algorithm filtered back projection (FBP), the reconstructed image would have extremely severe artifacts. Prior information could be used in few-view CT reconstruction to improve image quality, and similar prior images of the same person could provide much more reliable information. However, in most cases, the previous CT scans might be obtained a long time ago and not much the same as the current one...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226705/non-rigid-mri-ct-registration-for-effective-planning-of-prostate-brachytherapy
#7
I Hamdan, G Dardenne, J Bert, D Visvikis, I Hamdan, G Dardenne, J Bert, D Visvikis, I Hamdan, G Dardenne, J Bert, D Visvikis
Prostate brachytherapy is an intraoperative radiotherapy technique for irradiating prostate tumors by placing radioactive sources inside the prostate. CT image is used to calculate a personalized dose distribution (PDD) while the MRI is used to visualize the tumor and the organs at risk. Therefore, a registration of preoperative MRI and CT is essential since it could improve the overall precision of the treatment planning, the placement of radioactive sources inside the prostate as well as the visualization of the dose distribution with respect to the tumor...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225687/reducing-iodine-contrast-volume-in-ct-angiography-of-the-abdominal-aorta-using-integrated-tube-potential-selection-and-weight-based-method-without-compromising-image-quality
#8
Rogerio Vasconcelos, Terri J Vrtiska, Thomas A Foley, Thanila A Macedo, Juan C Montoya Cardona, Eric E Williamson, Cynthia H McCollough, Joel G Fletcher
OBJECTIVE: The purpose of this study is to determine whether image quality was maintained when a weight-based protocol incorporating tube potential selection was used to select lower iodine contrast volumes for aortic CT angiography (CTA). MATERIALS AND METHODS: Patients with potentially decreased renal function underwent CTA performed with the iodinated contrast volume determined using a table incorporating different tube potentials and patient weights. The image quality of CTA examinations performed with a reduced iodine volume (hereafter known as "low-iodine CTA examinations"), internal control CTA examinations (i...
March 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28225485/magnetic-resonance-mr-imaging-for-tumor-staging-and-definition-of-tumor-volumes-on-radiation-treatment-planning-in-nonsmall-cell-lung-cancer-a-prospective-radiographic-cohort-study-of-single-center-clinical-outcome
#9
Dan Zhao, Qiaoqiao Hu, Liping Qi, Juan Wang, Hao Wu, Guangying Zhu, Huiming Yu
We investigate the impact of magnetic resonance (MR) on the staging and radiotherapy planning for patients with nonsmall cell lung cancer (NSCLC).A total of 24 patients with NSCLC underwent MRI, which was fused with radiotherapy planning CT using rigid registration. Gross tumor volume (GTV) was delineated not only according to CT image alone (GTVCT), but also based on both CT and MR image (GTVCT/MR). For each patient, 2 conformal treatment plans were made according to GTVCT and GTVCT/MR, respectively. Dose-volume histograms (DVH) for lesion and normal organs were generated using both GTVCT and GTVCT/MR treatment plans...
February 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28225355/assessing-cardiac-function-from-total-variation-regularized-4-d-c-arm-ct-in-the-presence-of-angular-undersampling
#10
Oliver Taubmann, Viktor Haase, Guenter Lauritsch, Yefeng Zheng, Gregor Krings, Joachim Hornegger, Andreas Maier
Time-resolved tomographic cardiac imaging using an angiographic C-arm device may support clinicians during minimally invasive therapy by enabling a thorough analysis of the heart function directly in the catheter laboratory. However, clinically feasible acquisition protocols entail a highly challenging reconstruction problem which suffers from sparse angular sampling of the trajectory. Compressed sensing theory promises that useful images can be recovered despite massive undersampling by means of sparsity-based regularization...
February 22, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28223675/-low-dose-and-interval-administration-of-imatinib-in-a-patient-with-liver-metastasis-of-the-gastrointestinal-stromal-tumor-of-the-stomach-a-case-report
#11
Nobuhiro Morinaga, Hideyuki Saito, Chika Komine, Asuka Matsumoto, Toshihide Katoh, Naritaka Tanaka, Kenji Nakazato, Takuro Nakamura, Yoshinori Shitara, Masatoshi Ishizaki
A 69-year-old woman underwent proximal gastrectomy with distal pancreatectomy and splenectomy for a gastrointestinal stromal tumor of the stomach.Adjuvant imatinib was administered for a year.Two years after resection of the tumor, liver metastasis in S8 was detected.Therefore, imatinib was re-administered at 300mg/day.After a year of re-administration, the patient suffered muscle cramps in the hands, and therefore imatinib was administered with intervals, such as 4 weeks administration and 4 weeks rest.Re -administration of imatinib was effective and her liver metastasis decreased in size...
February 2017: Gan to Kagaku Ryoho. Cancer & Chemotherapy
https://www.readbyqxmd.com/read/28221263/use-of-model-based-iterative-reconstruction-to-improve-detection-of-congenital-cardiovascular-anomalies-in-infants-undergoing-free-breathing-computed-tomographic-angiography
#12
Seth Kligerman, Ferdia Bolster, Jason Mitchell, Travis Henry, Jean Jeudy, Charles S White
PURPOSE: The aim of the study was to assess the detection of congenital cardiovascular anomalies (congenital heart disease) in neonates and infants using model-based iterative reconstruction (MBIR) algorithm compared with hybrid iterative reconstruction (HIR) and filtered back projection (FBP) reconstructions on axial computed tomography (CT) performed at minimum scanner dose. MATERIALS AND METHODS: Over 1 year, all CT angiographies performed in infants below 3 months of age with congenital heart disease were assessed retrospectively...
March 2017: Journal of Thoracic Imaging
https://www.readbyqxmd.com/read/28221262/recent-advances-in-computed-tomographic-technology-cardiopulmonary-imaging-applications
#13
Azadeh Tabari, Roberto Lo Gullo, Venkatesh Murugan, Alexi Otrakji, Subba Digumarthy, Mannudeep Kalra
Cardiothoracic diseases result in substantial morbidity and mortality. Chest computed tomography (CT) has been an imaging modality of choice for assessing a host of chest diseases, and technologic advances have enabled the emergence of coronary CT angiography as a robust noninvasive test for cardiac imaging. Technologic developments in CT have also enabled the application of dual-energy CT scanning for assessing pulmonary vascular and neoplastic processes. Concerns over increasing radiation dose from CT scanning are being addressed with introduction of more dose-efficient wide-area detector arrays and iterative reconstruction techniques...
March 2017: Journal of Thoracic Imaging
https://www.readbyqxmd.com/read/28221093/u-s-diagnostic-reference-levels-and-achievable-doses-for-10-adult-ct-examinations
#14
Kalpana M Kanal, Priscilla F Butler, Debapriya Sengupta, Mythreyi Bhargavan-Chatfield, Laura P Coombs, Richard L Morin
Purpose To develop diagnostic reference levels (DRLs) and achievable doses (ADs) for the 10 most common adult computed tomographic (CT) examinations in the United States as a function of patient size by using the CT Dose Index Registry. Materials and Methods Data from the 10 most commonly performed adult CT head, neck, and body examinations from 583 facilities were analyzed. For head examinations, the lateral thickness was used as an indicator of patient size; for neck and body examinations, water-equivalent diameter was used...
February 21, 2017: Radiology
https://www.readbyqxmd.com/read/28220403/dosimetry-in-mars-spectral-ct-topas-monte-carlo-simulations-and-ion-chamber-measurements
#15
Gray Lu, Steven Marsh, Jerome Damet, Pierre Carbonez, John Laban, Christopher Bateman, Anthony Butler, Phil Butler
Spectral computed tomography (CT) is an up and coming imaging modality which shows great promise in revealing unique diagnostic information. Because this imaging modality is based on X-ray CT, it is of utmost importance to study the radiation dose aspects of its use. This study reports on the implementation and evaluation of a Monte Carlo simulation tool using TOPAS for estimating dose in a pre-clinical spectral CT scanner known as the MARS scanner. Simulated estimates were compared with measurements from an ionization chamber...
February 20, 2017: Australasian Physical & Engineering Sciences in Medicine
https://www.readbyqxmd.com/read/28220185/small-bowel-protection-in-imrt-for-rectal-cancer-a%C3%A2-dosimetric-study-on-supine-vs-prone-position
#16
Julia Koeck, Katharina Kromer, Frank Lohr, Tobias Baack, Kerstin Siebenlist, Sabine Mai, Sylvia Büttner, Jens Fleckenstein, Frederik Wenz
BACKGROUND: This treatment planning study analyzes dose coverage and dose to organs at risk (OAR) in intensity-modulated radiotherapy (IMRT) of rectal cancer and compares prone vs. supine positioning as well as the effect of dose optimization for the small bowel (SB) by additional dose constraints in the inverse planning process. PATIENTS AND METHODS: Based on the CT datasets of ten male patients in both prone and supine position, a total of four different IMRT plans were created for each patient...
February 20, 2017: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
https://www.readbyqxmd.com/read/28219193/-analysis-of-ct-perfusion-imaging-in-chronic-cerebral-circulatory-insufficiency-and-its-relationship-with-crossed-cerebellar-diaschisis
#17
S L Liu, Y Wang, Y Zhang, H L Xu, J C Wang, W W He, X T Qin, G Q Cao, Y J Yang, Q C Zhuge, W J Chen
Objective: To investigate the change of cerebral microcirculation of chronic cerebral circulation insufficiency(CCCI) patients and the relationship between CCCI and crossed cerebellar diaschisis(CCD)by using 320-detector row of low-dose volume CT perfusion imaging. Methods: A total of 158 patients (103 males, 55 females, from 45 to 82 years old, the mean age was 62.9) with symptoms of CCCI were admitted to the First Affiliated Hospital of Wenzhou Medical University from June 2013 to January 2016. Low-dose CTP imaging of whole brain was performed to them using 320-detector row volume CT scanner...
February 7, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28218383/stereotactic-ablative-radiation-therapy-as-a-potential-curative-treatment-in-duodenal-adenocarcinoma-a-case-report
#18
Francesco Maria Aquilanti, Maria Cristina Barba, Federico Bianciardi, Barbara Tolu, Barbara Nardiello, Giorgio Hamid Raza, Randa El Gawhary, Chiara D'Ambrosio, PierCarlo Gentile
PURPOSE: One of the rarest gastrointestinal neoplasm is small bowel cancer. Experience with its treatment modalities is limited. Stereotactic ablative radiation therapy (SABR) has improved, with image-guided radiation therapy becoming a curative option in many tumors. Especially when surgery cannot be performed due to comorbidities, SABR provides a good toxicity profile and an excellent tumor control rate owing to its specific schedule: high dose on a limited and well-defined area. METHODS: An 83-year-old man had arterial hypertension and congestive cardiomyopathy, with recent history of upper abdominal pain, weight loss over 10 kg, and progressive severe fatigue...
February 11, 2017: Tumori
https://www.readbyqxmd.com/read/28216519/study-of-preoperative-3d-ct-angiography-of-uterine-artery-in-patients-with-uterine-cervical-cancer
#19
Hitoshi Fujioka, Tomoyasu Kato, Miyuki Sone, Tatsuya Horita, Shunsuke Sugawara, Shinsuke Tsukagoshi
Depiction of the fine vessel can provide useful preoperative information for patients with uterine cervical cancer. Although angiography can visualize vessels in detail, it is invasive. MR-angiography is a minimally invasive method to depict vessels, but the resolution of images is insufficient for preoperative evaluation. In this study, we used less invasive three-dimensional CT angiography (3D-CTA) and reconstructed images of adaptive iterative dose resolution 3D (AIDR 3D) with display field of view (D-FOV), which are suitable for arteries with large and small diameters, and created the fusion images...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/28216389/mastery-of-pmdi-technique-asthma-control-and-quality-of-life-of-children-with-asthma-a-randomized-controlled-study-comparing-two-inhaler-technique-training-approaches
#20
Wesam G Ammari, Nussaibah Al-Hyari, Nathir Obeidat, Mona Khater, Amal Sabouba, Mark Sanders
OBJECTIVE: Verbal counselling (VC) is the clinical standard for training patients on correct inhaler use. Patients fail to recall their VC with time. Ethical approval was obtained to compare the pressurized metered dose inhaler (pMDI) VC with Trainhaler (TH), a novel pMDI inhalation flow and technique training device, in children with asthma. METHODS: At visit 1, 7-17 year-old children with a pMDI hand-lung coordination problem including a fast peak inhalation flow (PIF) through pMDI >60 L/min were randomized into either VC group that received verbal pMDI training; or into TH group that were trained on- and given TH to practice at home...
February 16, 2017: Pulmonary Pharmacology & Therapeutics
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