keyword
MENU ▼
Read by QxMD icon Read
search

CBCT Radiation

keyword
https://www.readbyqxmd.com/read/29789896/an-offline-technique-to-evaluate-residual-motion-of-the-diaphragm-during-deep-inspiratory-breath-hold-from-cone-beam-ct-datasets
#1
Manuel Blessing, Julian Hofmann, Lena Vogel, Judit Boda-Heggemann, Frank Lohr, Frederik Wenz, Florian Stieler, Anna Simeonova-Chergou
PURPOSE: In radiation therapy, the computer-assisted deep inspiration breath-hold (DIBH) technique is one approach to deal with respiratory motion of tumors in the lung, liver, or upper abdomen. However, inter- and intra-breath-hold deviations from an optimal static tumor position might occur. A novel method is presented to noninvasively measure the diaphragm position and thus estimate its residual deviation (as surrogate for the tumor position) based on cone-beam computed tomography (CBCT) projection data using active breathing control during acquisition...
May 22, 2018: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
https://www.readbyqxmd.com/read/29780046/-study-of-dose-recalculation-method-on-overriding-lung-density-using-cbct-image-in-the-thorax
#2
Hiroshi Watanabe, Shuichi Ozawa, Atsuyuki Ohashi, Koji Ikenaga, Kentaro Miki, Akito Saito, Teiji Nishio, Yuji Murakami, Yasushi Nagata
It is a useful method for the adaptive radiotherapy (ART) to calculate absorbed dose accurately on the image set taken by on-board cone beam computed tomography (CBCT) attached to linac for image-guided radiation therapy (IGRT). For this purpose, a simple and accurate calculation method is necessary. Several papers report that it is possible to calculate easily and accurately by using several methods of researches in the neck and prostate, but the lung density varies greatly depending on patient thorax condition...
2018: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/29774779/image-guided-radiation-therapy-for-post-operative-gynaecologic-cancer-patient-set-up-verification-with-and-without-implanted-fiducial-markers
#3
Donna H Murrell, Andrew Warner, Quinn Benwell, Wendy Wells, Danielle Scott, Vikram Velker, George Hajdok, David P D'Souza
BACKGROUND: Intensity modulated radiotherapy (IMRT) is increasingly being used to treat gynaecological malignancies in the postoperative setting. The purpose of this study was to evaluate the use of image-guided radiotherapy (IGRT) using cone-beam computed tomography (CBCT) with fiducial markers for daily localization. MATERIAL AND METHODS: A single institution study was performed of consecutive cervical or endometrial cancer patients receiving adjuvant external beam radiotherapy (n = 15)...
May 18, 2018: Acta Oncologica
https://www.readbyqxmd.com/read/29772077/a-feature-alignment-score-for-online-cone-beam-ct-based-image-guided-radiotherapy-for-prostate-cancer
#4
Catriona Hargrave, Timothy Deegan, Michael Poulsen, Tomasz Bednarz, Fiona Harden, Kerrie Mengersen
PURPOSE: To develop a method for scoring online cone-beam CT (CBCT)-to-planning CT image feature alignment to inform prostate image-guided radiotherapy (IGRT) decision-making. The feasibility of incorporating volume variation metric thresholds, predictive of delivering planned dose into weighted functions, was investigated. METHODS: Radiation therapists and radiation oncologists participated in workshops where they reviewed prostate CBCT-IGRT case examples and completed a paper-based survey of image feature matching practices...
May 17, 2018: Medical Physics
https://www.readbyqxmd.com/read/29764458/cone-beam-computed-tomography-in-implant-dentistry-recommendations-for-clinical-use
#5
Reinhilde Jacobs, Benjamin Salmon, Marina Codari, Bassam Hassan, Michael M Bornstein
BACKGROUND: In implant dentistry, three-dimensional (3D) imaging can be realised by dental cone beam computed tomography (CBCT), offering volumetric data on jaw bones and teeth with relatively low radiation doses and costs. The latter may explain why the market has been steadily growing since the first dental CBCT system appeared two decades ago. More than 85 different CBCT devices are currently available and this exponential growth has created a gap between scientific evidence and existing CBCT machines...
May 15, 2018: BMC Oral Health
https://www.readbyqxmd.com/read/29757464/ultrasonography-for-non-invasive-and-real-time-evaluation-of-peri-implant-tissue-dimensions
#6
Hsun-Liang Chan, Khaled Sinjab, Junying Li, Zhaozhao Chen, Hom-Lay Wang, Oliver D Kripfgans
AIM: Existing methods for evaluating marginal bone loss and tissue biotype around dental implants present with many limitations. The aim of this study was to examine the accuracy of high-resolution, 3-dimensional ultrasound to measure peri-implant tissue dimensions. MATERIAL AND METHODS: A 25-MHz ultrasound probe prototype was used to scan peri-implant tissues of 17 implants from 7 fresh human cadavers. Four ultrasonic measurements were made: the marginal bone level/thickness, and mucosal level/thickness...
May 14, 2018: Journal of Clinical Periodontology
https://www.readbyqxmd.com/read/29746014/dosimetric-and-geometric-characteristics-of-a-small-animal-image-guided-irradiator-using-3d-dosimetry-optical-ct-scanner
#7
Yong Hum Na, Yi-Fang Wang, Paul J Black, Christian Velten, Xin Qian, Shih-Chi Lin, John Adamovics, Cheng-Shie Wuu
PURPOSE: The precise dosimetric and geometric characteristics of small animal irradiators are essential to achieving reproducible dose delivery, especially in cases where image-guidance is utilized. Currently, radiochromic film is the established measurement tool used to evaluate beam characteristics for these systems. However, only 2D information can be acquired with film. This study characterized both the dosimetric and geometric properties of the small animal research radiation platform (SARRP, Xstrahl) for commissioning purposes using a 3D radiochromic dosimetry system with a sub-millimeter resolution optical computed tomography (OCT) scanner...
May 10, 2018: Medical Physics
https://www.readbyqxmd.com/read/29745761/diagnostic-reliability-of-low-dose-multidetector-computed-tomography-and-cone-beam-computed-tomography-in-maxillofacial-trauma-an-experimental-blinded-and-randomized-study
#8
Romke Rozema, Michiel Hj Doff, Peter Ma van Ooijen, Douwe Postmus, Henriëtte E Westerlaan, Martijn F Boomsma, Baucke van Minnen
OBJECTIVE: To assess the diagnostic reliability of low dose Multidetector Computed Tomography (MDCT) and Cone Beam Computed Tomography (CBCT) for zygomaticomaxillary fracture diagnosis. METHODS: Unilateral zygomaticomaxillary fractures were inflicted on four out of six fresh frozen human cadaver head specimens. All specimens were scanned using four MDCT and two CBCT imaging protocols of which the radiation exposure was systematically reduced. A blinded diagnostic routine was simulated at which 16 radiologists and 8 oral and maxillofacial (OMF) surgeons performed randomized image assessments...
May 10, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/29738014/percutaneous-bone-biopsy-using-a-flat-panel-cone-beam-computed-tomography-virtual-navigation-system
#9
Juan-Fang Liu, De-Chao Jiao, Jian-Zhuang Ren, Wen-Guang Zhang, Xin-Wei Han
OBJECTIVES: To assess the clinical role of flat-panel cone beam CT (CBCT) in performing percutaneous needle biopsy (PNB) of bone lesions. Flat-panel cone beam CT systems have been used as a guidance tool for performing percutaneous biopsy. Real-time fluoroscopy and virtual navigation systems help simplify needle path planning and shorten procedure times. METHODS: From March 2012 to March 2016, 80 patients with 80 bone lesions were retrospectively enrolled in the study in Zhengzhou city of China...
May 2018: Saudi Medical Journal
https://www.readbyqxmd.com/read/29738006/the-effect-of-varying-cone-beam-computed-tomography-image-resolution-and-field-of-view-centralization-on-effective-radiation-dose
#10
Fatima M Jadu, Asmaa A Alzahrani, Maha A Almutairi, Salma O Al-Amoudi, Ahmed M Jan, Mawya A Khafaji
To investigate changes in the effective radiation dose (E) in relation to variations in voxel (VOX) size settings and the field-of-view (FOV) centralization. Methods: This cross-sectional dosimetry study used nanoDot OSLD dosimeters placed at 25 pre-determined sites in the head and neck slices of a RANDO male phantom to measure the absorbed radiation. The imaging scans took place at King Abdulaziz University Dental Hospital, Jeddah, Saudi Arabia between September 2016 and May 2017 using the i-CAT classic cone beam computed tomography (CBCT)  unit...
May 2018: Saudi Medical Journal
https://www.readbyqxmd.com/read/29730063/daily-image-guidance-with-cone-beam-computed-tomography-may-reduce-radiation-pneumonitis-in-unresectable-non-small-cell-lung-cancer
#11
Nikhil Yegya-Raman, Sinae Kim, Matthew P Deek, Diana Li, Apar Gupta, Laura Bond, Abhishek Dwivedi, Joel K Braver, Meral Reyhan, Akaash Mittal, Bin Gui, Jyoti Malhotra, Joseph Aisner, Salma K Jabbour
PURPOSE: To investigate the impact of daily image-guided radiation therapy technique on clinical outcomes in patients with inoperable non-small cell lung cancer treated with definitive chemoradiation therapy. METHODS AND MATERIALS: We compared patients with inoperable non-small cell lung cancer receiving daily cone beam computed tomography (CBCT) after an initial 4-dimensional computed tomography (4DCT) simulation (n = 76) with those receiving daily 2-dimensional orthogonal kilovoltage (kV) imaging (n = 48)...
March 30, 2018: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/29722297/4d-cone-beam-computed-tomography-cbct-using-a-moving-blocker-for-simultaneous-radiation-dose-reduction-and-scatter-correction
#12
Cong Zhao, Yuncheng Zhong, Xinhui Duan, You Zhang, Xiaokun Huang, Jing Wang, Mingwu Jin
Four-dimensional (4D) X-ray cone-beam computed tomography (CBCT) is important for a precise radiation therapy for lung cancer. Due to the repeated use and 4D acquisition over a course of radiotherapy, the radiation dose becomes a concern. Meanwhile, the scatter contamination in CBCT deteriorates image quality for treatment tasks. In this work, we propose to use a moving blocker (MB) during the 4D CBCT acquisition ("4D MB") and to combine motion-compensated reconstruction to address these two issues simultaneously...
May 3, 2018: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29720332/standard-and-low-dose-cone-beam-computer-tomography-protocol-for-orthognatodontic-diagnosis-a-comparative-evaluation
#13
M Portelli, A Militi, A Lo Giudice, R Lo Giudice, R Fastuca, I Ielo, V Mongelli, G Lo Giudice, A Martintoni, M Manuelli, A Lucchese, R Nucera
Considering the diagnostic capability offered by cone-beam computed tomography (CBCT), nowadays orthodontists often use this exam for treatment planning, especially in cases of impacted teeth, maxillary ipoplasia, orthognathic surgery etc. The aim of this study was to compare the radiation doses related to a conventional CBCT setting and that of a low dose protocol, usable in orthodontic practice. The absorbed organ doses were measured using an anthropomorphic phantom loaded with thermo-luminescent dosimeters related to sensitive organs (brain, bone marrow, salivary glands, thyroid, esophagus, oral mucosa, extrathoracic airways, lymph nodes)...
March 2018: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/29706305/impact-of-rectal-distension-on-prostate-cbct-based-positioning-assessed-with-6-degrees-of-freedom-couch
#14
Julien Charret, Julia Salleron, Magali Quivrin, Frédéric Mazoyer, Paul Lesueur, Etienne Martin, Didier Peiffert, Gilles Créhange
INTRODUCTION: Prostate requires a daily correction of its 3-dimensional position in relation with rectal distension. In this study, we sought to determine whether rectal distension with respect to the rectal behavior might have an impact on prostate translations and/or rotations during prostate image guided radiation therapy using a 6 degrees-of-freedom (DOF) couch. METHODS AND MATERIALS: We reviewed the data from 39 patients with localized prostate cancer treated with protracted external radiation therapy using a 6 DOF couch...
March 9, 2018: Practical Radiation Oncology
https://www.readbyqxmd.com/read/29706222/using-a-single-cone-beam-computed-tomography-scan-to-obtain-full-occlusal-details-with-the-mandible-in-centric-relation-and-maximum-intercuspation
#15
Amr Ragab El-Beialy, Ayman El Nigoumi, Amgad Kaddah, Hisham Afify
INTRODUCTION: One obstacle with the implementation of digital technology in orthodontics is the acquisition of occlusal details while maintaining the mandible in the full interdigitation position. With 1 cone-beam computed tomography (CBCT) scan of the patient and 1 digital scan of the patient's dental models in occlusion, it might be possible to obtain full occlusal details and generate 2 volumes, with the mandible in centric relation and maximum intercuspation positions. The purpose of this article was to describe the technique...
May 2018: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/29703501/heart-volume-reduction-during-radiotherapy-involving-the-thoracic-region-in-children-an-unexplained-phenomenon
#16
Irma W E M van Dijk, Jorrit Visser, Jan Wiersma, Jessica R van Boggelen, Brian V Balgobind, Elizabeth A M Lieke Feijen, Sophie C Huijskens, Wouter E M Kok, Leontien C M Kremer, Coen R N Rasch, Arjan Bel
BACKGROUND AND PURPOSE: Radiotherapy involving the thoracic region is associated with cardiotoxicity in long-term childhood cancer survivors. We quantified heart volume changes during radiotherapy in children (<18 years) and investigated correlations with patient and treatment related characteristics. MATERIAL AND METHODS: Between 2010 and 2016, 34 children received radiotherapy involving the thoracic region. We delineated heart contours and measured heart volumes on 114 CBCTs...
April 24, 2018: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/29696321/linac-based-stereotactic-body-radiation-therapy-for-unresectable-locally-advanced-pancreatic-cancer-risk-adapted-dose-prescription-and-image-guided-delivery
#17
Rosario Mazzola, Sergio Fersino, Dario Aiello, Fabiana Gregucci, Umberto Tebano, Stefanie Corradini, Gioacchino Di Paola, Massimo Cirillo, Luca Tondulli, Giacomo Ruffo, Ruggero Ruggieri, Filippo Alongi
BACKGROUND: Stereotactic body radiation therapy (SBRT) represents a new treatment option for locally advanced pancreatic cancer (LAPC). An accurate treatment planning with risk-adapted dose prescription with adherence to specific dose constraints for organs at risk (OARs) and the use of daily cone beam CT (CBCT) for image guidance could allow an effective and safe treatment delivery. Here, feasibility and efficacy of SBRT in LAPC treated in our cancer care center are reported. PATIENTS AND METHODS: 33 unresectable LAPC patients underwent SBRT...
April 25, 2018: Strahlentherapie und Onkologie: Organ der Deutschen Röntgengesellschaft ... [et Al]
https://www.readbyqxmd.com/read/29687001/comparison-between-two-radiological-methods-for-assessment-of-tooth-root-resorption-an-in-vitro-study
#18
Sabina Saccomanno, Pier Carmine Passarelli, Bruno Oliva, Cristina Grippaudo
Purpose: This study aims to verify the validity of the radiographic image and the most effective radiological techniques for the diagnosis of root resorption to prevent, cure, and reduce it and to verify if radiological images can be helpful in medical and legal situations. Methods: 19 dental elements without root resorption extracted from several patients were examined: endooral and panoramic radiographs were performed, with traditional and digital methods. Then the root of each tooth was dipped into 3-4 mm of 10% nitric acid for 24 hours to simulate the resorption of the root and later submitted again to radiological examinations and measurements using the same criteria and methods...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29680252/demonstration-of-safety-and-feasibility-of-hydrogel-marking-of-the-pancreas-duodenum-interface-for-image-guided-radiation-therapy-igrt-in-a-porcine-model-implications-in-igrt-for-pancreatic-cancer-patients
#19
Avani D Rao, Eun Ji Shin, Sarah E Beck, Caroline Garrett, Seong-Hun Kim, Nam Ju Lee, Eleni Liapi, John Wong, Joseph Herman, Amol Narang, Kai Ding
PURPOSE: To test the feasibility and safety of injecting a high-contrast hydrogel marker at the head of the pancreas (HOP) and duodenum interface and assesses the marker visibility on cone beam computed tomography (CBCT) to localize this important boundary during image guided radiation therapy in a porcine model. METHODS AND MATERIALS: This was a 2-stage study. The feasibility/visibility stage evaluated the ability to place the hydrogel using endoscopic ultrasound guidance on 8 swine (4 euthanized at post-injection day 8, 4 euthanized at post-injection day 22) and assessed the quality of visibility of the marked location on CBCT in the longer-surviving group...
March 2, 2018: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/29664218/parotid-gland-radiation-dose-xerostomia-relationships-based-on-actual-delivered-dose-for-nasopharyngeal-carcinoma
#20
Jingjiao Lou, Pu Huang, Changsheng Ma, Yue Zheng, Jinhu Chen, Yueqiang Liang, Hongsheng Li, Yong Yin, Danhua Liu, Gang Yu, Dengwang Li
Xerostomia induced by radiotherapy is a common toxicity for head and neck carcinoma patients. In this study, the deformable image registration of planning computed tomography (CT) and weekly cone-beam CT (CBCT) was used to override the Hounsfield unit value of CBCT, and the modified CBCT was introduced to estimate the radiation dose delivered during the course of treatment. Herein, the beams from each patient's treatment plan were applied to the modified CBCT to construct the weekly delivered dose. Then, weekly doses were summed together to obtain the accumulated dose...
April 17, 2018: Journal of Applied Clinical Medical Physics
keyword
keyword
119991
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"