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Cone beam CT

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https://www.readbyqxmd.com/read/28926392/flexible-adult-acquired-flatfoot-deformity-comparison-between-weight-bearing-and-non-weight-bearing-measurements-using-cone-beam-computed-tomography
#1
Cesar de Cesar Netto, Lew C Schon, Gaurav K Thawait, Lucas Furtado da Fonseca, Apisan Chinanuvathana, Wojciech B Zbijewski, Jeffrey H Siewerdsen, Shadpour Demehri
BACKGROUND: The 3-dimensional nature of adult acquired flatfoot deformity can be challenging to characterize using radiographs. We tested the hypothesis that measurements on weight-bearing (WB) cone-beam computed tomography (CT) images were more useful for demonstrating the severity of the deformity than non-weight-bearing (NWB) measurements. METHODS: We prospectively enrolled 12 men and 8 women (mean age, 52 years; range, 20 to 88 years) with flexible adult acquired flatfoot deformity...
September 20, 2017: Journal of Bone and Joint Surgery. American Volume
https://www.readbyqxmd.com/read/28925991/a-multiscale-imaging-and-modelling-dataset-of-the-human-inner-ear
#2
Nicolas Gerber, Mauricio Reyes, Livia Barazzetti, Hans Martin Kjer, Sergio Vera, Martin Stauber, Pavel Mistrik, Mario Ceresa, Nerea Mangado, Wilhelm Wimmer, Thomas Stark, Rasmus R Paulsen, Stefan Weber, Marco Caversaccio, Miguel A González Ballester
Understanding the human inner ear anatomy and its internal structures is paramount to advance hearing implant technology. While the emergence of imaging devices allowed researchers to improve understanding of intracochlear structures, the difficulties to collect appropriate data has resulted in studies conducted with few samples. To assist the cochlear research community, a large collection of human temporal bone images is being made available. This data descriptor, therefore, describes a rich set of image volumes acquired using cone beam computed tomography and micro-CT modalities, accompanied by manual delineations of the cochlea and sub-compartments, a statistical shape model encoding its anatomical variability, and data for electrode insertion and electrical simulations...
September 19, 2017: Scientific Data
https://www.readbyqxmd.com/read/28924570/implementation-and-ct-sampling-characterization-of-a-third-generation-spect-ct-system-for-dedicated-breast-imaging
#3
Jainil P Shah, Steve D Mann, Randolph L McKinley, Martin P Tornai
Stand-alone cone beam computed tomography (CT) and single-photon emission computed tomography (SPECT) systems capable of complex acquisition trajectories have previously been developed for breast imaging. Fully three-dimensional (3-D) motions of SPECT systems provide views into the chest wall and throughout the entire volume. The polar tilting capability of the CBCT system has shown improvement in sampling close to the chest wall, while eliminating cone beam artifacts. Here, a single hybrid SPECT-CT system, with each individual modality capable of independently traversing complex trajectories around a common pendant breast volume, was developed...
July 2017: Journal of Medical Imaging
https://www.readbyqxmd.com/read/28921521/a-paradigm-for-evaluation-and-management-of-the-maxillary-sinus-before-dental-implantation
#4
Yi-Wei Chen, Fu-Ying Lee, Po-Hung Chang, Chi-Che Huang, Chia-Hsiang Fu, Chien-Chia Huang, Ta-Jen Lee
OBJECTIVES: To determine a paradigm for evaluating and managing maxillary sinus conditions before dental implantation via preoperative sinonasal assessment. STUDY DESIGN: Prospective cohort study. METHODS: Eighty-four patients who underwent dental implantation with or without sinus augmentation were included. Maxillary sinus conditions were classified into groups 1 to 6 according to cone-beam computed tomography (CT) findings: 1) nonspecific findings, 2) solitary polyp or cyst, 3) mucosal thickening, 4) air-fluid level or fluid accumulation, 5) near-total opacification of the maxillary or other paranasal sinus, and 6) calcification spots in the maxillary sinus...
September 16, 2017: Laryngoscope
https://www.readbyqxmd.com/read/28917250/emerging-technologies-in-stereotactic-body-radiotherapy
#5
Lijun Ma, Lei Wang, Chia-Lin Tseng, Arjun Sahgal
Stereotactic body radiation therapy (SBRT) stems from the initial developments of intra-cranial stereotactic radiosurgery (SRS). Despite similarity in their names and clinical goals of delivering a sufficiently high tumoricidal dose, maximal sparing of the surrounding normal tissues and a short treatment course, SBRT technologies have transformed from the early days of body frame-based treatments with X-ray verification to primarily image-guided procedures with cone-beam CT or stereoscopic X-ray systems and non-rigid body immo-bilization...
September 2017: Chinese Clinical Oncology
https://www.readbyqxmd.com/read/28901659/using-gamma-index-to-flag-changes-in-anatomy-during-image-guided-radiation-therapy-of-head-and-neck-cancer
#6
Bryan Schaly, Jeff Kempe, Varagur Venkatesan, Sylvia Mitchell, Jerry J Battista
During radiation therapy of head and neck cancer, the decision to consider replanning a treatment because of anatomical changes has significant resource implications. We developed an algorithm that compares cone-beam computed tomography (CBCT) image pairs and provides an automatic alert as to when remedial action may be required. Retrospective CBCT data from ten head and neck cancer patients that were replanned during their treatment was used to train the algorithm on when to recommend a repeat CT simulation (re-CT)...
September 13, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28901608/optimization-of-the-geometry-and-speed-of-a-moving-blocker-system-for-cone-beam-computed-tomography-scatter-correction
#7
Xi Chen, Luo Ouyang, Hao Yan, Xun Jia, Bin Li, Qingwen Lyu, You Zhang, Jing Wang
PURPOSE: X-ray scatter is a significant barrier to image quality improvements in cone-beam computed tomography (CBCT). A moving blocker-based strategy was previously proposed to simultaneously estimate scatter and reconstruct the complete volume within the field of view (FOV) from a single CBCT scan. A blocker consisting of lead stripes is inserted between the X-ray source and the imaging object, and moves back and forth along the rotation axis during gantry rotation. While promising results were obtained in our previous studies, the geometric design and moving speed of the blocker were set empirically...
September 2017: Medical Physics
https://www.readbyqxmd.com/read/28898423/iterative-volume-of-interest-based-4d-cone-beam-ct
#8
Rachael Martin, Moiz Ahmad, Geoffrey Hugo, Tinsu Pan
PURPOSE: 4D cone-beam CT (CBCT) has potential applications in soft tissue alignment and tumor motion verification at the time of radiation treatment. However, prominent streak artifacts with conventional image reconstructions have limited its clinical use and alternative reconstructions are generally too computationally expensive for the time available. We propose an iterative volume of interest based (I4D VOI) reconstruction technique, where 4D reconstruction is only performed within a VOI, to limit streak artifacts with limited added computation time...
September 12, 2017: Medical Physics
https://www.readbyqxmd.com/read/28876121/-the-role-of-cone-beam-ct-during-transarterial-chemoembolization-for-liver-cancer
#9
Péter Tamáska, Gergely Ráski, Ákos Pataki, István Lázár
PURPOSE: The role of interventional radiology in the treatment of hepatic malignancies is steeply raising. Our purpose is to present the importance of cone-beam CT (CBCT) during TACE (transarterial chemoembolization) procedures for liver tumours. PATIENTS AND METHODS: Between 1st of June 2013 and 31st of July 2016, we performed 130 TACE procedures in 64 patients in the Borsod University Teaching Hospital at Miskolc. During some of the treatments of 44 patients CBCT was also performed...
September 2017: Magyar Sebészet
https://www.readbyqxmd.com/read/28875339/c-arm-cone-beam-ct-for-intraprocedural-image-fusion-and-3d-guidance-in-portal-vein-embolization-pve
#10
Willie M Lüdemann, Georg Böning, Julius Chapiro, Martin Jonczyk, Dominik Geisel, Dirk Schnapauff, Gero Wieners, Moritz Schmelzle, Sascha Chopra, Rolf W Günther, Bernhard Gebauer, Florian Streitparth
PURPOSE: Portal vein embolization (PVE) is applied in patients with extended oncologic liver disease to induce hyperplasia of the future liver remnant and make resection feasible. Ultrasound (US) guidance is the gold standard for percutaneous portal vein access. This study evaluated feasibility and safety of C-arm cone beam computed tomography (CBCT) for needle guidance. MATERIALS AND METHODS: In 10 patients, puncture was performed under 3D needle guidance in a CBCT data set...
September 5, 2017: Cardiovascular and Interventional Radiology
https://www.readbyqxmd.com/read/28872156/indications-of-cone-beam-ct-in-head-and-neck-imaging-in-children
#11
U Walliczek-Dworschak, I Diogo, L Strack, M Mandapathil, A Teymoortash, J A Werner, C Güldner
For imaging of bony structures, especially for the anterior and lateral skull base in ORL medicine, cone beam computed tomography (CBCT) is an increasingly used alternative to CT, with a lower exposition to plain radiography that makes its use for imaging, particularly in children, very interesting. The aim of this study was to analyse possible indications and settings for CBCT in children and compare them to those of adults. A total of 554 patients (age range 0-18 years, mean age 10.36 years), who underwent CBCT between 01/2004-06/2013 in the ENT department at the university clinic of Marburg were enrolled in this retrospective analysis to evaluate technical parameters and indications...
August 2017: Acta Otorhinolaryngologica Italica
https://www.readbyqxmd.com/read/28871980/empowering-intensity-modulated-proton-therapy-through-physics-and-technology-an-overview
#12
REVIEW
Radhe Mohan, Indra J Das, Clifton C Ling
Considering the clinical potential of protons attributable to their physical characteristics, interest in proton therapy has increased greatly in this century, as has the number of proton therapy installations. Until recently, passively scattered proton therapy was used almost entirely. Notably, the overall clinical results to date have not shown a convincing benefit of protons over photons. A rapid transition is now occurring with the implementation of the most advanced form of proton therapy, intensity modulated proton therapy (IMPT)...
October 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28871830/comparison-of-panoramic-radiography-and-cone-beam-ct-in-the-assessment-of-juxta-apical-radiolucency
#13
Eduarda Hl Nascimento, Anne Cc Oenning, Hugo Gaêta-Araujo, Francisco Haiter-Neto, Bernardo B Freire, Deborah Q Freitas
OBJECTIVES: To compare the performance of panoramic radiography (PAN) and cone beam computed tomography (CBCT) in the detection of juxta-apical radiolucency (JAR), as well as to investigate, in CBCT images, if there are factors associated with the detection of JAR on PAN. METHODS: Two oral radiologists assessed the presence of JAR in PAN and CBCT images of 175 individuals (308 mandibular third molars). The cortical plates involvement and the JAR size and location were assessed on CBCT to evaluate if these factors were related to JAR detection on PAN...
September 5, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28870525/rectal-balloon-use-limits-vaginal-displacement-rectal-dose-and-rectal-toxicity-in-patients-receiving-imrt-for-postoperative-gynecological-malignancies
#14
Cheng-Chia Wu, Yen-Ruh Wuu, Theodore Yanagihara, Ashish Jani, Eric P Xanthopoulos, Akhil Tiwari, Jason D Wright, William M Burke, June Y Hou, Ana I Tergas, Israel Deutsch
Pelvic radiotherapy for gynecologic malignancies traditionally used a 4-field box technique. Later trials have shown the feasibility of using intensity-modulated radiotherapy (IMRT) instead. But vaginal movement between fractions is concerning when using IMRT due to greater conformality of the isodose curves to the target and the resulting possibility of missing the target while the vagina is displaced. In this study, we showed that the use of a rectal balloon during treatment can decrease vaginal displacement, limit rectal dose, and limit acute and late toxicities...
September 1, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28870227/cone-beam-ct-reconstruction-for-non-periodic-organ-motion-using-time-ordered-chain-graph-model
#15
Masahiro Nakano, Akihiro Haga, Jun'ichi Kotoku, Taiki Magome, Yoshitaka Masutani, Shouhei Hanaoka, Satoshi Kida, Keiichi Nakagawa
PURPOSE: The purpose of this study is to introduce the new concept of a four-dimensional (4D) cone-beam computed tomography (CBCT) reconstruction approach for non-periodic organ motion in cooperation with the time-ordered chain graph model (TCGM) and to compare it with previously developed methods such as total variation-based compressed sensing (TVCS) and prior-image constrained compressed sensing (PICCS). MATERIALS AND METHODS: Our proposed reconstruction is based on a model including the constraint originating from the images of neighboring time phases...
September 4, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28856901/type-2-endoleaks-in-endovascular-aortic-repair-cone-beam-ct-and-automatic-vessel-detection-to-guide-the-embolization
#16
Anna Maria Ierardi, Filippo Pesapane, Nicola Rivolta, Enrico Maria Fumarola, Salvatore Alessio Angileri, Filippo Piacentino, Gianpaolo Carrafiello
Background Dual-phase cone beam computed tomography (DP-CBCT) and automatic vessel detection (AVD) software are helpful tools for detecting arteries before planned endovascular interventions. Purpose To evaluate the usefulness of DP-CBCT and AVD software in guiding the trans-arterial embolization (TAE) of challenging T2 lumbar endoleaks (T2-L-EL). Material and Methods Ten patients with T2-L-EL were included in this study. The accuracy of DP-CBCT and the AVD software was defined by the ability to detect the endoleak and arterial feeding vessel, respectively...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/28856332/3d-image-fusion-to-localise-intercostal-arteries-during-tevar
#17
G Koutouzi, C Sandström, P Skoog, H Roos, M Falkenberg
PURPOSE: Preservation of intercostal arteries during thoracic aortic procedures reduces the risk of post-operative paraparesis. The origins of the intercostal arteries are visible on pre-operative computed tomography angiography (CTA), but rarely on intra-operative angiography. The purpose of this report is to suggest an image fusion technique for intra-operative localisation of the intercostal arteries during thoracic endovascular repair (TEVAR). TECHNIQUE: The ostia of the intercostal arteries are identified and manually marked with rings on the pre-operative CTA...
2017: EJVES Short Rep
https://www.readbyqxmd.com/read/28852638/repetition-of-examination-due-to-motion-artifacts-in-horizontal-cone-beam-ct-comparison-among-three-different-kinds-of-head-support
#18
Cosimo Nardi, Gian Giacomo Taliani, Alessandro Castellani, Luisa De Falco, Valeria Selvi, Linda Calistri
AIMS AND OBJECTIVES: The aim of this study was to evaluate the repetition rate of examination due to motion artifacts in horizontal cone beam computed tomography, using three different kinds of head support, with reference to the patient's age. Further purpose was to evaluate how comfortable head supports were. MATERIALS AND METHODS: Seven hundred and fifty patients underwent a maxillofacial/dental arches volumetric imaging scan. They were divided into three groups depending on the head support used: foam headrest, foam headrest with head strap, and head restraint helmet...
July 2017: Journal of International Society of Preventive & Community Dentistry
https://www.readbyqxmd.com/read/28849731/three-dimensional-dose-evaluation-in-breast-cancer-patients-to-define-decision-criteria-for-adaptive-radiotherapy
#19
Catharina M L Zegers, Jose A Baeza, Wouter van Elmpt, Lars H P Murrer, Karolien Verhoeven, Liesbeth Boersma, Frank Verhaegen, Sebastiaan M J J G Nijsten
BACKGROUND: Dose-guided adaptive radiation therapy (DGART) is the systematic evaluation and adaptation of the dose delivery during treatment for an individual patient. The aim of this study is to define quantitative action levels for DGART by evaluating changes in 3D dose metrics in breast cancer and correlate them with clinical expert evaluation. MATERIAL AND METHODS: Twenty-three breast cancer treatment plans were evaluated, that were clinically adapted based on institutional IGRT guidelines...
August 29, 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28845693/automatic-localization-of-three-dimensional-cephalometric-landmarks-on-cone-beam-ct-images-by-extracting-symmetry-features-of-the-skull
#20
Bala Chakravarthy Neelapu, Om Prakash Kharbanda, Viren Sardana, Abhishek Gupta, Srikanth Vasamsetti, Rajiv Balachandran, Harish Kumar Sardana
OBJECTIVES: To propose an algorithm for automatic localization of 3D cephalometric landmarks on CBCT data, those are useful for both cephalometric and upper airway volumetric analysis. METHODS: Twenty landmarks were targeted for automatic detection, of which twelve landmark sexists on the mid-sagittal plane. Automatic detection of mid-sagittal plane from the volume is a challenging task. Mid-sagittal plane is detected by extraction of statistical parameters of the symmetrical features of the skull...
August 27, 2017: Dento Maxillo Facial Radiology
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