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Four dimensional ct

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https://www.readbyqxmd.com/read/27903406/morphology-of-the-posteromedial-fragment-in-pertrochanteric-fractures-a-three-dimensional-computed-tomography-analysis
#1
Gaurav Sharma, Kiran Kumar Gn, Kavin Khatri, Ravijot Singh, Shivanand Gamanagatti, Vijay Sharma
BACKGROUND: In this study we describe the morphology of the posteromedial fragment in pertrochanteric fractures using 3D CT scans and answer two questions 1) Do differences exist between the 3D CT appearances of posteromedial fragments and the depictions made in the AO classification 2) Does the posteromedial fragment affect stability in pertrochanteric fractures, in terms of fracture collapse? METHODS: Preoperative CT scans of eight 31-A1 and fifty 31-A2 fractures were analysed...
November 17, 2016: Injury
https://www.readbyqxmd.com/read/27903350/-effect-of-lumbar-dorsal-muscle-injuries-on-lumbar-vertebral-bone-quality-of-rat
#2
X P Wang, S J Wang, P Yan, L L Zhu, M Q Li, Z Y Bian, J W Tian
Objective: To explored the effects of lumbar dorsal muscle damage on local lumbar vertebral bone quality. Methods: Thirty SD female rats, at age of 20 weeks, were randomly divided into three groups: control group, or say pseudo surgery group, an incision in the back were performed as CNT; bilateral erector spinal muscle group in which group bilateral lumbar erector spinal muscle were removed as RESM; castration group in which bilateral ovaries were resected as OVX.After three months, bone mineral density, microscopic CT and vertebral compression test were taken in lumbar vertebral (L4-6) in turn...
November 22, 2016: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/27898749/-dosimetric-comparison-of-different-techniques-for-external-beam-accelerated-partial-breast-irradiation
#3
Gábor Stelczer, Tibor Major, Norbert Mészáros, Csaba Polgár, Csilla Pesznyák
The aim of this article is to evaluate and compare four different radiotherapy techniques of accelerated partial breast irradiation (APBI) considering planning quality, dosimetric and practical aspects. The investigated techniques are three dimensional conformal radiotherapy (3D-CRT), "step and shoot" (SS) and "sliding window" (SW) intensity-modulated radiotherapy, intensity-modulated arc therapy (RA). CT scans of 10 patients previously treated with APBI were selected for the study. Surgical clips were placed on the borders of the tumour bed during breast conserving surgery...
November 29, 2016: Magyar Onkologia
https://www.readbyqxmd.com/read/27895491/comparison-of-internal-target-volumes-defined-on-3-dimensional-4-dimensonal-and-cone-beam-ct-images-of-non-small-cell-lung-cancer
#4
Fengxiang Li, Jianbin Li, Zhifang Ma, Yingjie Zhang, Jun Xing, Huanpeng Qi, Dongping Shang
PURPOSE: The purpose of this study was to compare the positional and volumetric differences of internal target volumes defined on three-dimensional computed tomography (3DCT), four-dimensional CT (4DCT), and cone-beam CT (CBCT) images of non-small-cell lung cancer (NSCLC). MATERIALS AND METHODS: Thirty-one patients with NSCLC sequentially underwent 3DCT and 4DCT simulation scans of the thorax during free breathing. The first CBCT was performed and registered to the planning CT using the bony anatomy registration during radiotherapy...
2016: OncoTargets and Therapy
https://www.readbyqxmd.com/read/27889091/breath-hold-pet-ct-guided-tumour-ablation-under-general-anaesthesia-accuracy-of-tumour-image-registration-and-projected-ablation-zone-overlap
#5
P B Shyn, S Tremblay-Paquet, K Palmer, S Tatli, K Tuncali, O I Olubiyi, N Hata, S G Silverman
AIM: To assess single-breath-hold combined positron-emission tomography/computed tomography (PET/CT) for accuracy of tumour image registration and projected ablation volume overlap in patients undergoing percutaneous PET/CT-guided tumour-ablation procedures under general anaesthesia. MATERIALS AND METHODS: Eight patients underwent 12 PET/CT-guided tumour-ablation procedures to treat 20 tumours in the lung, liver, or adrenal gland. Using breath-hold PET/CT, the centre of the tumour was marked on each PET and CT acquisition by four readers to assess two- (2D) and three-dimensional (3D) spatial misregistration...
November 23, 2016: Clinical Radiology
https://www.readbyqxmd.com/read/27885540/automatic-abdominal-multi-organ-segmentation-using-deep-convolutional-neural-network-and-time-implicit-level-sets
#6
Peijun Hu, Fa Wu, Jialin Peng, Yuanyuan Bao, Feng Chen, Dexing Kong
PURPOSE: Multi-organ segmentation from CT images is an essential step for computer-aided diagnosis and surgery planning. However, manual delineation of the organs by radiologists is tedious, time-consuming and poorly reproducible. Therefore, we propose a fully automatic method for the segmentation of multiple organs from three-dimensional abdominal CT images. METHODS: The proposed method employs deep fully convolutional neural networks (CNNs) for organ detection and segmentation, which is further refined by a time-implicit multi-phase evolution method...
November 24, 2016: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/27884463/gated-carbon-ion-scanning-treatment-for-pancreatic-tumour-with-field-specific-target-volume-and-organs-at-risk
#7
Kentaro Miki, Shinichiro Mori, Miho Shiomi, Shigeru Yamada
OBJECTIVE: To assess the feasibility of treatment planning for pancreatic tumours subject to respiratory motion using field-specific target volumes (FTV) and field-specific organs at risk (FOAR) using four-dimensional computed tomography (4DCT). METHODS: Fourteen pancreatic cancer patients underwent 4DCT. Radiation oncologists contoured the gross tumour volume (GTV), clinical target volume (CTV), spinal cord, duodenum, kidneys, and stomach. The gating duty cycle was set to 30 % around exhalation...
November 21, 2016: Physica Medica: PM
https://www.readbyqxmd.com/read/27877865/three-dimensional-printed-macroporous-polylactic-acid-hydroxyapatite-composite-scaffolds-for-promoting-bone-formation-in-a-critical-size-rat-calvarial-defect-model
#8
Haifeng Zhang, Xiyuan Mao, Zijing Du, Wenbo Jiang, Xiuguo Han, Danyang Zhao, Dong Han, Qingfeng Li
We have explored the applicability of printed scaffold by comparing osteogenic ability and biodegradation property of three resorbable biomaterials. A polylactic acid/hydroxyapatite (PLA/HA) composite with a pore size of 500 μm and 60% porosity was fabricated by three-dimensional printing. Three-dimensional printed PLA/HA, β-tricalcium phosphate (β-TCP) and partially demineralized bone matrix (DBM) seeded with bone marrow stromal cells (BMSCs) were evaluated by cell adhesion, proliferation, alkaline phosphatase activity and osteogenic gene expression of osteopontin (OPN) and collagen type I (COL-1)...
2016: Science and Technology of Advanced Materials
https://www.readbyqxmd.com/read/27876661/fusion-three-dimensional-angiography-of-both-internal-carotid-arteries-in-the-evaluation-of-anterior-communicating-artery-aneurysms
#9
Kuhyun Yang, Hae-Won Koo, Wonhyoung Park, Jin Su Kim, Choong Gon Choi, Jung Cheol Park, Jae Sung Ahn, Do Hoon Kwon, Byung Duk Kwun, Deok Hee Lee
BACKGROUND: To determine whether 'fusion 3D angiography' of both internal carotid arteries (ICAs) can better disclose vascular details in patients diagnosed with anterior communicating artery (ACoA) aneurysms by computed tomography angiography (CTA) or magnetic resonance angiography (MRA). METHODS: Thirty-eight patients diagnosed with ACoA aneurysms by CTA or MRA were evaluated by the new post-processing feature, fusion 3D angiography, with results individually interpreted by four experts...
November 19, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27875568/gated-volumetric-modulated-arc-therapy-vs-tumor-tracking-cyberknife-radiotherapy-as-stereotactic-body-radiotherapy-for-hepatocellular-carcinoma-a-dosimetric-comparison-study-focused-on-the-impact-of-respiratory-motion-managements
#10
KyoungJun Yoon, Jungwon Kwak, Byungchul Cho, Jin-Hong Park, Sang Min Yoon, Sang-Wook Lee, Jong Hoon Kim
PURPOSE: To assess the potential dosimetric benefits associated with the CyberKnife (CK) tumor tracking capability, wherein an extra margin for respiratory tumor motion is not required, when compared to respiratory-gated volumetric-modulated arc therapy (VMAT) for hepatocellular carcinoma (HCC). METHODS: Twenty-nine HCC patients previously treated with double-arc VMAT were enrolled. In each VMAT plan, the individual internal target volume (ITV) margin around the tumor was determined by measuring its motion over 30-70% of respiratory phases using four-dimensional computed tomography, followed by a 5-mm isotropic margin for the planning target volume (PTV)...
2016: PloS One
https://www.readbyqxmd.com/read/27858071/-anatomy-of-temporomandibular-joint-and-condyle-position-in-uygur-adult-patients-evaluated-with-cone-beam-ct
#11
Jie-Rui Wang, Xu Pan, Cong-Bo Mi
PURPOSE: To compare the anatomy and condyle-fossa relationship difference between Uygur adult patients with Class I and Class II division 1 malocclusion by three dimensional cone-beam CT (CBCT). METHODS: Sixty-four patients with Class I and Class II division 1 malocclusion were selected, and the CBCT scans of their temporomandibular joints were taken.The difference of the condylar morphology and location between Class I and Class II division 1 patients was analyzed with SPSS 17...
August 2016: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/27846900/4dct-and-cbct-based-ptv-margin-in-stereotactic-body-radiotherapy-sbrt-of-non-small-cell-lung-tumor-adhered-to-chest-wall-or-diaphragm
#12
Yi Li, Jing-Lu Ma, Xin Chen, Feng-Wen Tang, Xiao-Zhi Zhang
BACKGROUND: Large tumor motion often leads to larger treatment volumes, especially the lung tumor located in lower lobe and adhered to chest wall or diaphragm. The purpose of this work is to investigate the impacts of planning target volume (PTV) margin on Stereotactic Body Radiotherapy (SBRT) in non-small cell lung cancer (NSCLC). METHODS: Subjects include 20 patients with the lung tumor located in lower lobe and adhered to chest wall or diaphragm who underwent SBRT...
November 15, 2016: Radiation Oncology
https://www.readbyqxmd.com/read/27837120/recommendations-for-high-risk-clinical-target-volume-definition-with-computed-tomography-for-three-dimensional-image-guided-brachytherapy-in-cervical-cancer-patients
#13
Tatsuya Ohno, Masaru Wakatsuki, Takafumi Toita, Yuko Kaneyasu, Ken Yoshida, Shingo Kato, Noriko Li, Sunao Tokumaru, Hitoshi Ikushima, Takashi Uno, Shin-Ei Noda, Tomoko Kazumoto, Yoko Harima
Our purpose was to develop recommendations for contouring the computed tomography (CT)-based high-risk clinical target volume (CTVHR) for 3D image-guided brachytherapy (3D-IGBT) for cervical cancer. A 15-member Japanese Radiation Oncology Study Group (JROSG) committee with expertise in gynecological radiation oncology initiated guideline development for CT-based CTVHR (based on a comprehensive literature review as well as clinical experience) in July 2014. Extensive discussions occurred during four face-to-face meetings and frequent email communication until a consensus was reached...
November 10, 2016: Journal of Radiation Research
https://www.readbyqxmd.com/read/27834761/three-dimensional-visualization-of-human-cardiac-conduction-tissue-in-whole-heart-specimens-by-high-resolution-phase-contrast-ct-imaging-using-synchrotron-radiation
#14
Gen Shinohara, Kiyozo Morita, Masato Hoshino, Yoshihiro Ko, Takuro Tsukube, Yukihiro Kaneko, Hiroyuki Morishita, Yoshihiro Oshima, Hironori Matsuhisa, Ryuma Iwaki, Masashi Takahashi, Takaaki Matsuyama, Kazuhiro Hashimoto, Naoto Yagi
BACKGROUND: The feasibility of synchrotron radiation-based phase-contrast computed tomography (PCCT) for visualization of the atrioventricular (AV) conduction axis in human whole heart specimens was tested using four postmortem structurally normal newborn hearts obtained at autopsy. METHODS: A PCCT imaging system at the beamline BL20B2 in a SPring-8 synchrotron radiation facility was used. The PCCT imaging of the conduction system was performed with "virtual" slicing of the three-dimensional reconstructed images...
November 2016: World Journal for Pediatric & Congenital Heart Surgery
https://www.readbyqxmd.com/read/27834416/accuracy-and-efficiency-of-full-arch-digitalization-and-3d-printing-a-comparison-between-desktop-model-scanners-an-intraoral-scanner-a-cbct-model-scan-and-stereolithographic-3d-printing
#15
Christian Wesemann, Jonas Muallah, James Mah, Axel Bumann
OBJECTIVE: The primary objective of this study was to compare the accuracy and time efficiency of an indirect and direct digitalization workflow with that of a three-dimensional (3D) printer in order to identify the most suitable method for orthodontic use. METHOD AND MATERIALS: A master model was measured with a coordinate measuring instrument. The distances measured were the intercanine width, the intermolar width, and the dental arch length. Sixty-four scans were taken with each of the desktop scanners R900 and R700 (3Shape), the intraoral scanner TRIOS Color Pod (3Shape), and the Promax 3D Mid cone beam computed tomography (CBCT) unit (Planmeca)...
November 10, 2016: Quintessence International
https://www.readbyqxmd.com/read/27832419/temporal-averaging-for-analysis-of-four-dimensional-whole-heart-computed-tomography-perfusion-of-the-myocardium-proof-of-concept-study
#16
S Feger, A Shaban, S Lukas, C Kendziorra, M Rief, E Zimmermann, M Dewey
To assess the feasibility of four-dimensional (4D) whole-heart computed tomography perfusion (CTP) of the myocardium and the added value of temporal averaging of consecutive 3D datasets from different heartbeats for analysis. We included 30 patients with suspected or known coronary artery disease (CAD) who underwent 320-row coronary CT angiography (CTA) and myocardial CTP. Out of these, 15 patients underwent magnetic resonance myocardial perfusion imaging (MR MPI). All CTP examinations were initiated after 3 min of intravenous infusion of adenosine (140 µg/kg/min) and were performed dynamically covering the entire heart every heart beat over a period of 20 ± 3 heart beats...
November 10, 2016: International Journal of Cardiovascular Imaging
https://www.readbyqxmd.com/read/27830486/three-patterns-of-acetabular-deficiency-are-common-in-young-adult-patients-with-acetabular-dysplasia
#17
Jeffrey J Nepple, Joel Wells, James R Ross, Asheesh Bedi, Perry L Schoenecker, John C Clohisy
BACKGROUND: Detailed recognition of the three-dimensional (3-D) deformity in acetabular dysplasia is important to help guide correction at the time of reorientation during periacetabular osteotomy (PAO). Common plain radiographic parameters of acetabular dysplasia are limited in their ability to characterize acetabular deficiency precisely. The 3-D characterization of such deficiencies with low-dose CT may allow for more precise characterization. QUESTIONS/PURPOSES: The purposes of this study were (1) to determine the variability in 3-D acetabular deficiency in acetabular dysplasia; (2) to define subtypes of acetabular dysplasia based on 3-D morphology; (3) to determine the correlation of plain radiographic parameters with 3-D morphology; and (4) to determine the association of acetabular dysplasia subtype with patient clinical characteristics including sex, range of motion, and femoral version...
November 9, 2016: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/27829750/bone-density-assessment-for-evaluation-of-gender-differences-in-cervical-vertebral-maturation-a-computed-tomography-study
#18
K Usha, Balashanmugam Baskaranarayanan, D Nagarajan, R Selvarani, M Vijjaykanth
INTRODUCTION: The cervical vertebral maturation (CVM) method is a vital tool for assessing the biological maturation of the orthodontic patient to evaluate the amount of mandibular bone growth left. AIM: To assess and visualize the cervical vertebral morphology (bone density) of orthodontic patients of the age group 9,16,27 years. MATERIAL AND METHODS: Twenty four subjects with age group of 9,16,27 who were randomly selected and subjected to 3d tomographic study to estimate the biological age of the orthodontic patients by analyzing c1 c2 and c3 vertebrae...
October 2016: Journal of Pharmacy & Bioallied Sciences
https://www.readbyqxmd.com/read/27826388/investigation-of-the-effects-of-storage-time-on-the-dimensional-accuracy-of-impression-materials-using-cone-beam-computed-tomography
#19
Murat Alkurt, Zeynep Yeşıl Duymus, Numan Dedeoglu
PURPOSE: The storage conditions of impressions affect the dimensional accuracy of the impression materials. The aim of the study was to assess the effects of storage time on dimensional accuracy of five different impression materials by cone beam computed tomography (CBCT). MATERIALS AND METHODS: Polyether (Impregum), hydrocolloid (Hydrogum and Alginoplast), and silicone (Zetaflow and Honigum) impression materials were used for impressions taken from an acrylic master model...
October 2016: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/27812324/big-cat-coalitions-a-comparative-analysis-of-regional-brain-volumes-in-felidae
#20
Sharleen T Sakai, Bradley M Arsznov, Ani E Hristova, Elise J Yoon, Barbara L Lundrigan
Broad-based species comparisons across mammalian orders suggest a number of factors that might influence the evolution of large brains. However, the relationship between these factors and total and regional brain size remains unclear. This study investigated the relationship between relative brain size and regional brain volumes and sociality in 13 felid species in hopes of revealing relationships that are not detected in more inclusive comparative studies. In addition, a more detailed analysis was conducted of four focal species: lions (Panthera leo), leopards (Panthera pardus), cougars (Puma concolor), and cheetahs (Acinonyx jubatus)...
2016: Frontiers in Neuroanatomy
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