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https://www.readbyqxmd.com/read/27922831/comprehensive-monte-carlo-study-of-patient-doses-from-cone-beam-ct-imaging-in-radiotherapy
#1
T E Marchant, K D Joshi
Accurate knowledge of ionizing radiation dose from cone-beam CT (CBCT) imaging in radiotherapy is important to allow concomitant risks to be estimated and for justification of imaging exposures. This study uses a Monte Carlo CBCT model to calculate imaging dose for a wide range of imaging protocols for male and female patients. The Elekta XVI CBCT system was modeled using GATE and simulated doses were validated against measurements in a water tank and thorax phantom. Imaging dose was simulated in the male and female ICRP voxel phantoms for a variety of anatomical sites and imager settings (different collimators, filters, full and partial rotation)...
December 6, 2016: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/27920610/volumetric-image-guided-highly-conformal-radiotherapy-of-the-prostate-bed-toxicity-analysis
#2
Gianluca Ingrosso, Alessandra Carosi, Daniela di Cristino, Elisabetta Ponti, Andrea Lancia, Alessandra Murgia, Claudia Bruni, Pasquale Morelli, Franca Pietrasanta, Riccardo Santoni
AIM: To evaluate toxicity of high conformal image-guided radiotherapy of the prostate bed. BACKGROUND: Radiotherapy of the prostate bed has a pivotal role in the post-operative and salvage settings, but few clinical data are available on the use of daily image guidance in combination with highly conformal techniques, and data on long-term results are lacking. MATERIALS AND METHODS: We analyzed 118 patients irradiated on the prostate bed using conformal plans processed with a micro-multileaf collimator, and daily checking treatment set-up with a cone-beam CT system...
January 2017: Reports of Practical Oncology and Radiotherapy
https://www.readbyqxmd.com/read/27914917/the-role-of-dual-phase-cone-beam-ct-in-predicting-short-term-response-after-transarterial-chemoembolization-for-hepatocellular-carcinoma
#3
Kerstin Müller, Sanjit Datta, Sonja Gehrisch, Moiz Ahmad, Mohammed Ahmed Abdelrazek Mohammed, Jarrett Rosenberg, Gloria L Hwang, John D Louie, Daniel Y Sze, Nishita Kothary
PURPOSE: To identify computational and qualitative features derived from dual-phase cone-beam CT that predict short-term response in patients undergoing transarterial chemoembolization for hepatocellular carcinoma (HCC). MATERIALS AND METHODS: This retrospective study included 43 patients with 59 HCCs. Six features were extracted, including intensity of tumor enhancement on both phases and characteristics of the corona on the washout phase. Short-term response was evaluated by modified Response Evaluation Criteria in Solid Tumors on follow-up imaging, and extracted features were correlated to response using univariate and multivariate analyses...
November 30, 2016: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/27911351/evaluation-of-differential-phase-contrast-cone-beam-ct-imaging-system
#4
Jiangkun Liu, Weixing Cai, Ruola Ning
Grating-based differential phase contrast (DPC) imaging enables the use of a hospital-grade X-ray tube, but compromises the image quality due to insufficiently coherent illumination. In this research, a bench-top DPC cone beam CT (DPC-CBCT) was systematically evaluated and compared with the traditional attenuation-based CBCT in terms of contrast to noise ratio, noise property, and contrast resolution through phantom studies. In order to evaluate DPC-CBCT for soft tissue imaging, breast specimen and small animal studies were carried out...
November 30, 2016: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/27910717/dose-optimisation-for-assessment-of-periodontal-structures-in-cone-beam-ct-examinations
#5
Ayman Al-Okshi, Chrysoula Theodorakou, Christina Lindh
OBJECTIVE: To investigate the relationship between dose and image quality for a dedicated dental Cone Beam CT (CBCT) scanner using different scanning protocols and to set up an optimal imaging protocol for assessment of periodontal structures. METHODS: Radiation dose and image quality measurements were made using the 3D Accuitomo 170 dental CBCT scanner. The SedentexCT IQ phantom was used to investigate the relationship between contrast-to-noise ratio (CNR) and dose-area product (DAP)...
December 2, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27909659/reliability-of-the-planned-pedicle-screw-trajectory-versus-the-actual-pedicle-screw-trajectory-using-intra-operative-3d-ct-and-image-guidance
#6
Catherine A Miller, Charles G Ledonio, Matthew A Hunt, Farhan Siddiq, David W Polly
BACKGROUND: Technological advances, including navigation, have been made to improve safety and accuracy of pedicle screw fixation. We evaluated the accuracy of the virtual screw placement (Stealth projection) compared to actual screw placement (intra-operative O-Arm) and examined for differences based on the distance from the reference frame. METHODS: A retrospective evaluation of prospectively collected data was conducted from January 2013 to September 2013. We evaluated thoracic and lumbosacral pedicle screws placed using intraoperative O-arm and Stealth navigation by obtaining virtual screw projections and intraoperative O-arm images after screw placement...
2016: International Journal of Spine Surgery
https://www.readbyqxmd.com/read/27900591/treatment-of-lung-tumours-with-high-energy-microwave-ablation-a-single-centre-experience
#7
Anna Maria Ierardi, Andrea Coppola, Natalie Lucchina, Gianpaolo Carrafiello
The purpose of our study is to report safety, technical success, effectiveness, local progression-free survival (LPFS) and overall survival of percutaneous microwave ablation (MWA) to treat lung tumours unsuitable for surgery. Nineteen patients with thirty-one tumours (mean diameter 2.4 cm) underwent percutaneous MWA in 28 sessions. Microwave ablation was carried out using a 2450-MHz generator (Emprint/Covidien, Boulder, CO, USA). Procedures were performed under cone-beam CT (CBCT) and under fluoro-CT (one session) guidance...
January 2017: Medical Oncology
https://www.readbyqxmd.com/read/27895964/half-fan-based-intensity-weighted-region-of-interest-imaging-for-low-dose-cone-beam-ct-in-image-guided-radiation-therapy
#8
Boyeol Yoo, Kihong Son, Rizza Pua, Jinsung Kim, Alexander Solodov, Seungryong Cho
OBJECTIVES: With the increased use of computed tomography (CT) in clinics, dose reduction is the most important feature people seek when considering new CT techniques or applications. We developed an intensity-weighted region-of-interest (IWROI) imaging method in an exact half-fan geometry to reduce the imaging radiation dose to patients in cone-beam CT (CBCT) for image-guided radiation therapy (IGRT). While dose reduction is highly desirable, preserving the high-quality images of the ROI is also important for target localization in IGRT...
October 2016: Healthcare Informatics Research
https://www.readbyqxmd.com/read/27895878/evaluation-of-visibility-of-foreign-bodies-in-the-maxillofacial-region-comparison-of-computed-tomography-cone-beam-computed-tomography-ultrasound-and-magnetic-resonance-imaging
#9
Solmaz Valizadeh, Hamidreza Pouraliakbar, Leila Kiani, Yaser Safi, Leila Alibakhshi
BACKGROUND: Detection of foreign bodies (FBs) is challenging. Selection of a fast and affordable imaging modality to locate the FB with minimal patient radiation dose is imperative. OBJECTIVES: This study sought to compare four commonly used imaging modalities namely cone beam computed tomography (CBCT), magnetic resonance imaging (MRI), computed tomography (CT), and ultrasound (US) for detection of FBs in the head and neck region. MATERIALS AND METHODS: In this in vitro study, iron, glass, stone, wood, asphalt, and tooth samples measuring 0...
October 2016: Iranian Journal of Radiology: a Quarterly Journal Published By the Iranian Radiological Society
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
#10
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/27894664/tomographic-osteometry-of-the-zygomatic-bone-applied-to-traumatology-of-facial-bones-preliminary-retrospective-study-of-zygomatic-summit-in-28-patients
#11
Barbara Lerhe, Sarah Alshehri, Denis Ferachon, Sébastien Dejean, Anne Sophie Salabert, Raphael Lopez
BACKGROUND: The available referential measures defining the zygomatic bone morphology are adequate enough for full determination of the zygoma positioning, especially for trauma surgery, but osteometric analysis of the zygoma positioning based on tomographic examinations could be useful in peroperative and postoperative imaging. In this study, we propose referential measures, taking into account the morphology and the symmetry of the zygoma. In addition, the reliability and reproducibility are considered...
October 28, 2016: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/27893451/rotating-and-translating-anthropomorphic-head-voxel-models-to-establish-an-horizontal-frankfort-plane-for-dental-cbct-monte-carlo-simulations-a-dose-comparison-study
#12
A Stratis, G Zhang, R Jacobs, R Bogaerts, H Bosmans
In order to carry out Monte Carlo (MC) dosimetry studies, voxel phantoms, modeling human anatomy, and organ-based segmentation of CT image data sets are applied to simulation frameworks. The resulting voxel phantoms preserve patient CT acquisition geometry; in the case of head voxel models built upon head CT images, the head support with which CT scanners are equipped introduces an inclination to the head, and hence to the head voxel model. In dental cone beam CT (CBCT) imaging, patients are always positioned in such a way that the Frankfort line is horizontal, implying that there is no head inclination...
December 21, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27890761/the-coexistence-of-extradural-arteriovenous-fistula-and-soft-tissue-arteriovenous-malformation-within-the-same-metamere
#13
Nobuhiko Arai, Takenori Akiyama, Kazunari Yoshida
BACKGROUND: -Spinal arteriovenous shunts are a common spinal vascular disorder. However, they can have a misleading clinical presentation and poor prognosis. They are classified into 4 types according to shunt points and drainage route, among which extradural arteriovenous fistula (eAVF) is the most rare, comprising only 1% of all spinal arteriovenous shunts. Here, we report an extremely rare case of coexistent eAVF at the craniocervical junction and soft tissue arteriovenous malformation (AVM) within the same metamere...
November 24, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27889430/classification-of-teeth-in-cone-beam-ct-using-deep-convolutional-neural-network
#14
Yuma Miki, Chisako Muramatsu, Tatsuro Hayashi, Xiangrong Zhou, Takeshi Hara, Akitoshi Katsumata, Hiroshi Fujita
Dental records play an important role in forensic identification. To this end, postmortem dental findings and teeth conditions are recorded in a dental chart and compared with those of antemortem records. However, most dentists are inexperienced at recording the dental chart for corpses, and it is a physically and mentally laborious task, especially in large scale disasters. Our goal is to automate the dental filing process by using dental x-ray images. In this study, we investigated the application of a deep convolutional neural network (DCNN) for classifying tooth types on dental cone-beam computed tomography (CT) images...
November 12, 2016: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/27881158/evaluation-of-daily-patient-positioning-for-radiotherapy-with-a-commercial-3d-surface-imaging-system-catalyst%C3%A2
#15
F Walter, P Freislederer, C Belka, C Heinz, M Söhn, F Roeder
BACKGROUND: To report our initial clinical experience with the novel surface imaging system Catalyst™ (C-RAD AB, Sweden) in connection with an Elekta Synergy linear accelerator for daily patient positioning in patients undergoing radiation therapy. METHODS: We retrospectively analyzed the patient positioning of 154 fractions in 25 patients applied to thoracic, abdominal, and pelvic body regions. Patients were routinely positioned based on skin marks, shifted to the calculated isocenter position and treated after correction via cone beam CT which served as gold standard...
November 24, 2016: Radiation Oncology
https://www.readbyqxmd.com/read/27878463/tracking-of-the-inferior-alveolar-nerve-its-implication-in-surgical-planning
#16
Jimoh O Agbaje, Elke Van de Casteele, Ahmed S Salem, Dickson Anumendem, Ivo Lambrichts, Constantinus Politis
OBJECTIVES: The objective of the study is to assess the correlation between the mandibular canal tracing done on cone beam CT (CBCT) data, with the size, shape, and position of the neurovascular bundle (NB) obtained by magnetic resonance imaging (MRI). MATERIAL AND METHODS: Six human cadaver mandibles were scanned with a CBCT Promax® scanner (Planmeca, Helsinki, Finland) and with an Ingenia® 3.0 T MR system (Philips, Amsterdam, The Netherlands). The NB was segmented from the MRI dataset, while the mandibular canal (MC) tracing was done on the CBCT images...
November 22, 2016: Clinical Oral Investigations
https://www.readbyqxmd.com/read/27875762/review-of-clinical-studies-and-first-clinical-experiences-with-a-commercially-available-cone-beam-breast-ct-in-europe
#17
REVIEW
Susanne Wienbeck, Joachim Lotz, Uwe Fischer
The dedicated cone-beam breast computed tomography (CBBCT) is a new and promising imaging modality which provides isotropic, 3D images of the breast with high spatial and contrast resolution. Non-contrast and contrast-enhanced CBBCT (CE-CBBCT) was superior to mammography for the visualization of breast masses, especially in patients with dense breast tissue. CE-CBBCT accurately detects DCIS and distinguishes it from benign causes of microcalcifications when compared with non-contrast CBBCT and mammography. The purpose of this report is to describe the technology and its possible indications, and to present the first results from recent clinical studies, illustrating these with our own image examples...
November 17, 2016: Clinical Imaging
https://www.readbyqxmd.com/read/27869556/evaluation-of-on-and-off-line-bioluminescence-tomography-system-for-focal-irradiation-guidance
#18
Bin Zhang, John W Wong, Iulian I Iordachita, Juvenal Reyes, Katriana Nugent, Phuoc T Tran, Stephen W Tuttle, Constantinos Koumenis, Ken Kang-Hsin Wang
In response to the limitations of computed tomography (CT) and cone-beam CT (CBCT) in irradiation guidance, especially for soft-tissue targets without the use of contrast agents, our group developed a solution that implemented bioluminescence tomography (BLT) as the image-guidance modality for preclinical radiation research. However, adding such a system to existing small animal irradiators is no small task. A potential solution is to utilize an off-line BLT system in close proximity to the irradiator, with stable and effective animal transport between the two systems...
November 21, 2016: Radiation Research
https://www.readbyqxmd.com/read/27869185/metal-artifact-reduction-through-mvcbct-and-kvct-in-radiotherapy
#19
Gao Liugang, Sun Hongfei, Ni Xinye, Fang Mingming, Cao Zheng, Lin Tao
This study proposes a new method for removal of metal artifacts from megavoltage cone beam computed tomography (MVCBCT) and kilovoltage CT (kVCT) images. Both images were combined to obtain prior image, which was forward projected to obtain surrogate data and replace metal trace in the uncorrected kVCT image. The corrected image was then reconstructed through filtered back projection. A similar radiotherapy plan was designed using the theoretical CT image, the uncorrected kVCT image, and the corrected image...
November 21, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27866848/analysis-of-gtv-reduction-during-radiotherapy-for-oropharyngeal-cancer-implications-for-adaptive-radiotherapy
#20
Olga Hamming-Vrieze, Simon R van Kranen, Wilma D Heemsbergen, Charlotte A H Lange, Michiel W M van den Brekel, Marcel Verheij, Coen R N Rasch, Jan Jakob Sonke
BACKGROUND AND PURPOSE: Adaptive field size reduction based on gross tumor volume (GTV) shrinkage imposes risk on coverage. Fiducial markers were used as surrogate for behavior of tissue surrounding the GTV edge to assess this risk by evaluating if GTVs during treatment are dissolving or actually shrinking. MATERIALS AND METHODS: Eight patients with oropharyngeal tumors treated with chemo-radiation were included. Before treatment, fiducial markers (0.035×0.2cm(2), n=40) were implanted at the edge of the primary tumor...
November 18, 2016: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
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