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CBCT Radiation

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https://www.readbyqxmd.com/read/29340290/tailoring-four-dimensional-cone-beam-ct-acquisition-settings-for-fiducial-marker-based-image-guidance-in-radiation-therapy
#1
Peng Jin, Niek van Wieringen, Maarten C C M Hulshof, Arjan Bel, Tanja Alderliesten
Use of four-dimensional cone-beam CT (4D-CBCT) and fiducial markers for image guidance during radiation therapy (RT) of mobile tumors is challenging due to the trade-off among image quality, imaging dose, and scanning time. This study aimed to investigate different 4D-CBCT acquisition settings for good visibility of fiducial markers in 4D-CBCT. Using these 4D-CBCTs, the feasibility of marker-based 4D registration for RT setup verification and manual respiration-induced motion quantification was investigated...
April 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29327076/arms-down-cone-beam-ct-hepatic-angiography-performance-assessment-vascular-imaging-quality-and-imaging-artifacts
#2
Adrian J Gonzalez-Aguirre, Elena N Petre, Meier Hsu, Chaya S Moskowitz, Stephen B Solomon, Jeremy C Durack
INTRODUCTION: The practice of positioning patients' arms above the head during catheter-injected hepatic arterial phase cone beam CT (A-CBCT) imaging has been inherited from standard CT imaging due to image quality concerns, but interrupts workflow and extends procedure time. We sought to assess A-CBCT image quality and artifacts with arms extended above the head versus down by the side. METHODS: We performed an IRB approved retrospective evaluation of reformatted and 3D-volume rendered images from 91 consecutive A-CBCTs (43 arms up, 48 arms down) acquired during hepatic tumor arterial embolization procedures...
January 11, 2018: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/29303367/radiation-dose-from-x-ray-examinations-of-impacted-canines-cone-beam-computed-tomography-vs-two-dimensional-imaging
#3
Nils Kadesjö, Randi Lynds, Mats Nilsson, Xie-Qi Shi
OBJECTIVES: To compare the radiation dose to children examined for impacted canines, using two-dimensional examinations (panoramic and periapical radiographs) and cone-beam computed tomography (CBCT). METHODS: Organ doses were determined using an anthropomorphic 10-year child phantom. Two CBCT devices, a ProMax3D and a NewTom5G, were examined using thermoluminescent dosimeters. For the panoramic radiograph, a Promax device was used and for periapical radiographs, a Prostyle device with a ProSensor digital sensor was used...
January 5, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/29298859/fast-acquisition-cone-beam-computed-tomography-initial-experience-with-a-10-s-protocol
#4
Visish M Srinivasan, Gouthami Chintalapani, Kevin Matthew Camstra, Sabih T Effendi, Jacob Cherian, Jeremiah N Johnson, Stephen R Chen, Peter Kan
BACKGROUND: Cone-beam computed tomography (CBCT) facilitates the acquisition of cross-sectional imaging in angiography suites using a rotational C-arm and digital flat panel detectors. The applications are numerous, including evaluation of implanted devices and localization of cerebrovascular lesions. We present and validate the clinical utility of an alternative fast CBCT acquisition protocol in the context of neurovascular device imaging. METHODS: Contrast-enhanced (CE)-CBCT images were acquired using a new 10 s protocol in a phantom head model, swine model, and in patients...
January 3, 2018: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/29282134/small-field-dosimetry-for-the-small-animal-radiotherapy-research-platform-sarrp
#5
Mihaela Ghita, Stephen J McMahon, Hannah F Thompson, Conor K McGarry, Raymond King, Sarah O S Osman, Jonathan L Kane, Amanda Tulk, Giuseppe Schettino, Karl T Butterworth, Alan R Hounsell, Kevin M Prise
BACKGROUND: Preclinical radiation biology has become increasingly sophisticated due to the implementation of advanced small animal image guided radiation platforms into laboratory investigation. These small animal radiotherapy devices enable state-of-the-art image guided therapy (IGRT) research to be performed by combining high-resolution cone beam computed tomography (CBCT) imaging with an isocentric irradiation system. Such platforms are capable of replicating modern clinical systems similar to those that integrate a linear accelerator with on-board CBCT image guidance...
December 28, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/29258694/systematic-intrafraction-shifts-of-mediastinal-lymph-node-targets-between-setup-imaging-and-radiation-treatment-delivery-in-lung-cancer-patients
#6
Mai Lykkegaard Schmidt, Lone Hoffmann, Ditte S Møller, Marianne Marquard Knap, Torben Riis Rasmussen, Birgitte Holst Folkersen, Per Rugaard Poulsen
BACKGROUND AND PURPOSE: Internal target motion results in geometrical uncertainties in lung cancer radiotherapy. In this study, we determined the intrafraction motion and baseline shifts of mediastinal lymph node (LN) targets between setup imaging and treatment delivery. MATERIAL AND METHODS: Ten lung cancer patients with 2-4 fiducial markers implanted in LN targets received intensity-modulated radiotherapy with a daily setup cone-beam CT (CBCT) scan used for online soft-tissue match on the primary tumor...
December 16, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/29235120/two-dimensional-antiscatter-grid-a-novel-scatter-rejection-device-for-cone-beam-computed-tomography
#7
Timur Alexeev, Brian Kavanagh, Moyed Miften, Cem Altunbas
PURPOSE: Scattered radiation remains to be a major cause of image quality degradation in Flat Panel Detector (FPD) based Cone-beam computed tomography (CBCT). We have been investigating a novel two dimensional antiscatter grid (2D-ASG) concept to reduce scatter intensity, and hence improve CBCT image quality. We present the first CBCT imaging experiments performed with the 2D-ASG prototype, and demonstrate its efficacy in improving CBCT image quality. METHODS: A 2D-ASG prototype with septa focused to x-ray source was additively manufactured from tungsten and mounted on a Varian TrueBeam CBCT system...
December 12, 2017: Medical Physics
https://www.readbyqxmd.com/read/29202879/the-effect-of-prone-and-supine-treatment-positions-for-the-pre-operative-treatment-of-rectal-cancer-on-organ-at-risk-sparing-and-setup-reproducibility-using-volumetric-modulated-arc-therapy
#8
Anthony Kim, Aliaksandr Karotki, Joe Presutti, Glen Gonzales, Shun Wong, William Chu
BACKGROUND AND PURPOSE: To compare organ-at-risk doses and setup reproducibility using the prone and supine orientations in volumetric modulated arc therapy (VMAT) for rectal cancer. MATERIALS AND METHODS: Seventeen consecutive rectal cancer patients undergoing preoperative radiation were selected and setup in either the prone (N = 8) or supine (N = 9) position. All patients were treated using posteriorly-applied VMAT. Bladder and small bowel dose and cone beam CT (CBCT) reproducibility metrics were retrospectively collected...
December 5, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/29198389/cumulative-dose-of-radiation-therapy-of-hepatocellular-carcinoma-patients-and-its-deterministic-relation-to-radiation-induced-liver-disease
#9
Pu Huang, Gang Yu, Daniel S Kapp, Xue-Feng Bian, Chang-Sheng Ma, Hong-Sheng Li, Jin-Hu Chen, Yue-Qiang Liang, Yang Zhang, Shao-Hua Qin, Yao-Qin Xie, Yong Yang, Yong Yin, Lei Xing, Deng-Wang Li
This study aimed to investigate the relationship between dose and radiation-induced liver disease (RILD) in patients with hepatocellular carcinoma (HCC) receiving 3-dimensional conformal radiotherapy (3DCRT). Twenty-three patients with HCC who received conventional fractionated 3DCRT, including 7 who were diagnosed with classic RILD, were enrolled in this retrospective investigation. Cone-beam computed tomography (CBCT) scans were acquired at the time of treatment for each patient. The beams from each patient's treatment plan were applied to each pretreatment CBCT (the modified CBCT or mCBCT) to construct the delivered dose distribution of the day considering inter-treatment anatomy changes...
November 29, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/29197432/predoctoral-and-postdoctoral-education-on-cone-beam-computed-tomography
#10
Allison Buchanan, Karan Thachil, Chris Haggard, Sajitha Kalathingal
OBJECTIVES: As the use of cone beam computed tomography (CBCT) in dentistry continues to grow, questions related to appropriate radiation safety, training, and interpretation arise. Recognizing this need, the American Dental Association published an advisory statement for the safe use of CBCT in dentistry and recommended that guidelines for appropriate training be established. The purpose of this study was to assess radiation safety concerns related to CBCT and identify voids in current education on CBCT for the predoctoral dental curriculum and continuing dental education...
December 2017: Journal of Evidence-based Dental Practice
https://www.readbyqxmd.com/read/29192888/low-dose-cbct-reconstruction-using-hessian-schatten-penalties
#11
Liang Liu, Xinxin Li, Kai Xiang, Jing Wang, Shan Tan
Cone-beam computed tomography (CBCT) has been widely used in radiation therapy. For accurate patient setup and treatment target localization, it is important to obtain high-quality reconstruction images. The total variation (TV) penalty has shown the state-of-the-art performance in suppressing noise and preserving edges for statistical iterative image reconstruction, but it sometimes leads to the so-called staircase effect. In this paper, we proposed to use a new family of penalties-the Hessian Schatten (HS) penalties-for the CBCT reconstruction...
December 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/29188451/pediatric-cleft-palate-patients-show-a-3-to-5-fold-increase-in-cumulative-radiation-exposure-from-dental-radiology-compared-with-an-age-and-gender-matched-population-a-retrospective-cohort-study
#12
Reinhilde Jacobs, Ruben Pauwels, William C Scarfe, Carl De Cock, Karl Dula, Guy Willems, An Verdonck, Constantinus Politis
OBJECTIVE: The objective of the study was to compare estimates of pediatric cumulative exposure and lifetime attributable risk (LAR) of radiation-induced cancer from dental radiology between cleft palate (CP) subjects and age- and gender-matched controls (non-CP), with and without orthodontic treatment. MATERIALS AND METHODS: The radiation exposure frequency of CP subjects and non-CP controls with and without orthodontic treatment was compared for two-dimensional radiography (intra-oral, panoramic and cephalometric radiography), computed tomography (CT), and cone-beam CT (CBCT) using cumulative radiation dose as an estimate...
November 29, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29187181/could-cone-beam-computed-tomography-demonstrate-the-lateral-accessory-canals
#13
Yan Ji, Shanhui Wen, Shu Liu, Min Zhu, Menghuan Yao, Tiemei Wang, Zitong Lin
BACKGROUND: Recently, using cone-beam computed tomography (CBCT) to assess root canal morphology has become popular; however, few studies have examined its efficiency to assess the entire root canals, including the tiny lateral and accessory canals (LACs). This study aimed to assess the ability of CBCT to evaluate the root canal of mandibular incisors at three different scanning settings, compared with the canal staining and tooth clearing (CS) technique as the gold standard. METHODS: CBCT images of 70 extracted mandibular incisors were taken using NewTom VG CBCT at high-resolution scan mode (HZ), zoom scan mode (ZS), and full scan mode (FS), with different scanning settings...
November 29, 2017: BMC Oral Health
https://www.readbyqxmd.com/read/29173912/generation-of-synthetic-ct-using-multi-scale-and-dual-contrast-patches-for-brain-mri-only-external-beam-radiotherapy
#14
Souha Aouadi, Ana Vasic, Satheesh Paloor, Tarraf Torfeh, Maeve McGarry, Primoz Petric, Mohamed Riyas, Rabih Hammoud, Noora Al-Hammadi
PURPOSE: To create a synthetic CT (sCT) from conventional brain MRI using a patch-based method for MRI-only radiotherapy planning and verification. METHODS: Conventional T1 and T2-weighted MRI and CT datasets from 13 patients who underwent brain radiotherapy were included in a retrospective study whereas 6 patients were tested prospectively. A new contribution to the Non-local Means Patch-Based Method (NMPBM) framework was done with the use of novel multi-scale and dual-contrast patches...
October 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/29166133/dosimetric-impact-of-gastrointestinal-air-column-in-radiation-treatment-of-pancreatic-cancer
#15
Neil C Estabrook, Jonathan B Corn, Marvene E Ewing, Higinia R Cardenes, Indra J Das
OBJECTIVE: Dosimetric evaluation of air column in gastro-intestinal (GI) structures in IMRT of pancreatic cancer. METHODS: Nine sequential patients were retrospectively chosen for dosimetric analysis of air column in the GI apparatus in pancreatic cancer using cone beam CT (CBCT). The 4DCT was used for target and organs at risk (OARs) and non-coplanar IMRT was used for treatment. Once/week, these patients underwent CBCT for air filling, isocenter verification and dose calculations retrospectively...
November 22, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/29154259/evaluation-of-coefficients-to-derive-organ-and-effective-doses-from-cone-beam-ct-cbct-scans-a-monte-carlo-study
#16
Abdullah Abuhaimed, Colin J Martin
Regular imaging is used throughout image guided radiation therapy (IGRT) to improve treatment delivery. In order for treatment procedures to be optimized, the doses delivered by imaging exposures should be taken into account. CT dosimetry methods based on the CT dose index (CTDI), measured with a 100 mm long pencil ionization chamber (CTDI<sub>100</sub>) in standard phantoms, are not designed for the cone beam CT (CBCT) imaging systems used in radiotherapy, therefore a modified version has been proposed for CBCT by the International Electrotechnical Commission (CTDI<sub>IEC</sub>)...
November 20, 2017: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/29153368/diagnostic-value-of-cone-beam-computed-tomography-cbct-in-occult-scaphoid-and-wrist-fractures
#17
Christophe Borel, Ahmed Larbi, Stephanie Delclaux, Franck Lapegue, Helene Chiavassa-Gandois, Nicolas Sans, Marie Faruch-Bilfeld
OBJECTIVE: Evaluate the diagnostic value of cone beam computed tomography (CBCT) for scaphoid and wrist fractures that are missed on standard radiographs. MATERIALS AND METHODS: Between September 2014 and October 2015, we prospectively enrolled 49 patients with a clinically suspected scaphoid fracture following an acute injury but had normal radiographs. Each patients underwent radiographs, CBCT and (magnetic resonance imaging) MRI within 7days of the initial injury event...
December 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/29125035/cone-beam-computed-tomography-cbct-for-adaptive-image-guided-head-and-neck-radiation-therapy
#18
Christian A Hvid, Ulrik V Elstrøm, Kenneth Jensen, Cai Grau
BACKGROUND: Adaptive (ART) and image guided radiation therapy (IGRT) can improve target coverage and reduce unnecessary irradiation of organs at risk (OAR). The purpose of this study is to report the results of using mid-course imaging and a novel workflow with cone-beam computed tomography (CBCT) surveillance of dose to OAR to trigger adaptive replanning in head and neck radiotherapy. MATERIAL AND METHODS: Impact of radiation therapist (RTT) managed match protocol and mid-course imaging was assessed in two cohorts of consecutive patients receiving RT to the head and neck region, using computed tomography (CT) and CBCT-based dose verification respectively...
November 10, 2017: Acta Oncologica
https://www.readbyqxmd.com/read/29124381/intraprocedural-3d-perfusion-measurement-during-chemoembolisation-with-doxorubicin-eluting-beads-in-liver-metastases-of-malignant-melanoma
#19
Philippe L Pereira, Kristina Krüger, Ernst Hohenstein, Florian Welke, Christof Sommer, Friedegund Meier, Thomas Eigentler, Claus Garbe
OBJECTIVES: To study feasibility and validity of a new software application for intraprocedural assessment of perfusion during chemoembolisation of melanoma metastases. METHODOLOGY: In a prospective phase-II trial, ten melanoma patients with liver-only metastases underwent chemoembolisation with doxorubicin-eluting beads (DEBDOX-TACE). Tumour perfusion was evaluated immediately before and after treatment at cone beam computer tomography (CBCT) using a new software application...
November 9, 2017: European Radiology
https://www.readbyqxmd.com/read/29122361/ventilation-measured-on-clinical-4d-cbct-increased-ventilation-accuracy-through-improved-image-quality
#20
Kasper R Jensen, Carsten Brink, Olfred Hansen, Uffe Bernchou
BACKGROUND AND PURPOSE: Ventilation measured on 4D cone-beam computed tomography (CBCT) using deformable image registration (DIR) may predict specific radiation sensitivity, but the measurement is affected by the current image quality. With 4D computed tomography (CT) measured ventilation acting as a gold standard the current study investigates if image improvements increase the accuracy of 4D-CBCT measured ventilation. MATERIAL AND METHODS: The study consists of 4D-CBCT and 4D-CT scans of 20 non-small-cell lung cancer patients...
November 6, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
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