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https://www.readbyqxmd.com/read/28944361/cone-beam-computed-tomography-with-ultra-low-dose-protocols-for-pre-implant-radiographic-assessment-an-in-vitro-study
#1
Robert Liljeholm, Nils Kadesjö, Daniel Benchimol, Kristina Hellén-Halme, Xie-Qi Shi
PURPOSE: To evaluate the ultra-low dose scanning protocols of a newly developed CBCT for pre-implant radiographic assessment. MATERIALS AND METHODS: A total number of 32 CBCT scans were exposed at 90 kV using ProMax 3D's standard (GS) and three ultra-low dose scanning protocols: high, mid and low definition (UL-HD, UL-MD and UL-LD) on eight human dry skulls with simulated soft tissue. The mAs values and the voxel size were 96mAs/200 µm, 28mAs/150 µm, 22.4mAs/200 µm and 7...
2017: European Journal of Oral Implantology
https://www.readbyqxmd.com/read/28944359/crestal-sinus-lift-using-an-implant-with-an-internal-l-shaped-channel-1-year-after-loading-results-from-a-prospective-cohort-study
#2
Marco Tallarico, David L Cochran, Erta Xhanari, Claudia Dellavia, Elena Canciani, Eitan Mijiritsky, Silvio Mario Meloni
PURPOSE: To evaluate the clinical and radiographic outcomes of a one-stage crestal sinus elevation procedure using a self-tapping endosseous implant system (iRaise, Maxillent, Herzliya, Israel) developed for sinus augmentation, 1 year after loading. MATERIALS AND METHODS: Patients needing restoration in the posterior maxilla with a residual alveolar crest of 3 to 8 mm in height and 5 mm in width distal to the canine as measured on CBCT scan were treated using the iRaise sinus lift system...
2017: European Journal of Oral Implantology
https://www.readbyqxmd.com/read/28942233/comparison-of-radiation-doses-imparted-during-128-multislice-ct-scanners-and-cone-beam-computed-tomography-for-intra-and-perioperative-cochlear-implant-assessment
#3
N Guberina, U Dietrich, D Arweiler-Harbeck, M Forsting, A Ringelstein
PURPOSE: To examine radiation-doses imparted during multislice (MSCT) and cone-beam computed-tomography (CBCT) for perioperative examination of cochlear-implant insertion. METHODS: Radiation-doses were assessed during standardized petrous-bone CT-protocols at different MSCT ((I) single-source CT-scanner Somatom-Definition-AS+, (II) 2nd generation of dual-source CT-scanner Somatom-Definition-Flash, (III) 3rd generation of dual-source CT-scanner Somatom-Force and at the CBCT Ziehm-Vision-RFD3D ((IV) (a) RFD-3D (Standard-modifier), (b) RFD-3D (Low-dose-modifier))...
September 19, 2017: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/28940528/assessment-of-a-photon-counting-detector-for-a-dual-energy-c-arm-angiographic-system
#4
Moiz Ahmad, Rebecca Fahrig, Leland Pung, Martin Spahn, Niko S Köster, Silke Reitz, Teri Moore, Jang-Hwan Choi, Waldo Hinshaw, Yan Xia, Kerstin Müller
PURPOSE: This article presents the implementation and assessment of photon-counting dual-energy x-ray detector technology for angiographic C-arm systems in interventional radiology. METHODS: A photon-counting detector was successfully integrated into a clinical C-arm CT system. Detector performance was assessed using image uniformity metrics in both 2D projections and 3D cone-beam computed tomography (CBCT) images. Uniform exposure fields were acquired to analyze projection images and scans of a homogeneous cylinder phantom were taken to analyze 3D reconstructions...
September 22, 2017: Medical Physics
https://www.readbyqxmd.com/read/28939180/what-is-the-optimal-number-of-library-plans-in-art-for-locally-advanced-cervical-cancer
#5
E Nováková, S T Heijkoop, S Quint, A G Zolnay, J W M Mens, J Godart, B J M Heijmen, M S Hoogeman
PURPOSE: Library-of-plans ART is used to manage daily anatomy changes in locally advanced cervical cancer. In our institute, the library contains 2 VMAT plans for patients with large cervix-uterus motion. Increasing this number could be beneficial for tissue sparing, but is burdensome while the dosimetric gain is yet unclear. This study's aim is to determine the optimal number of plans at an individual patient level. MATERIAL AND METHODS: Data of 14 treated patients were analyzed...
September 19, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28937905/combined-orthodontic-and-surgical-treatment-in-a-8-years-old-patient-affected-by-severe-obstructive-sleep-apnea-a-case-report
#6
Antonio Gracco, Giovanni Bruno, Alberto de Stefani, Rosario Marchese Ragona, Sergio Mazzoleni, Edoardo Stellini
An eight-years-old girl showed a restless sleep with snoring and severe apnea episodes, a mandibular retrognathia, mouth breathing, maxillary transverse discrepancy, mandibular transverse discrepancy, moderate crowding and anterior open-bite. The CBCT showed an anterior collapse of the epiglottis. The treatment consisted in a rapid palatal expansion, an epiglottoplasty and a reduction of the tongue base. Polysomnography revealed that apnea-hypopnea index improved from 21,8 episodes/hr at the baseline to 0,6 episodes/hr, average oxygen saturation from 96,5% to 98,1%, oxygen desaturation events from 23,4 episodes/hr to 1/hr...
September 22, 2017: Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/28937285/assessment-of-automatic-segmentation%C3%A2-of-teeth-using%C3%A2-a-watershed-based-method
#7
Antoine Galibourg, Jean Dumoncel, Norbert Telmon, Adèle Calvet, Jérôme Michetti, Delphine Maret
OBJECTIVES: Tooth 3D automatic segmentation (AS) is being actively developed in research and clinical fields. Here, we assess the effect of automatic segmentation using a watershed-based method on the accuracy and reproducibility of 3D reconstructions in volumetric measurements by comparing it with a semi-automatic (SAS) method that has already been validated. METHODS: The study sample comprised 52 teeth, scanned with micro computed tomography (micro CT) (41µm voxel size) and cone beam computed tomography (CBCT) (76 ; 200 and 300 µm voxel size)...
September 21, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28937273/cone-beam-ct-acquisition-during-transradial-tace-made-easy-use-of-the-swivel-arm-board
#8
Uei Pua, Chia Chia Teo, Pe Thet U, Lawrence Han Hwee Quek
OBJECTIVE: Transradial access for peripheral intervention often requires certain modification from its coronary counterparts. One of the challenges during transradial transarterial chemoembolization (TACE) is the need for the access arm to be repositioned during cone-beam CT (CBCT) acquisition to allow for C-arm rotation. We recently introduced a swivel arm board to allow seamless repositioning of the access arm during and after CBCT acquisition. The purpose of this study is to detail the technique and feasibility of this useful adjunct to transradial TACE...
September 13, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28935486/the-effects-of-surgically-assisted-rapid-maxillary-expansion-sarme-on-the-dental-show-and-chin-projection
#9
Tong Xi, Magdalena Laskowska, Neeltje van de Voort, Hossein Ghaeminia, Wojciech Pawlak, Stefaan Bergé, Thomas Maal
OBJECTIVE: To quantify the postoperative changes of the dental show and chin projection following SARME using 3D CBCT imaging. MATERIAL AND METHODS: 78 patients with transversal maxillary hypoplasia and mandibular hypoplasia who underwent SARME were enrolled into the study. A cone beam computed tomography (CBCT) scan was acquired preoperatively and at least 1 year postoperatively. 3D postoperative changes in the dental show and pogonion position were measured based on soft tissue and hard tissue landmarks...
August 31, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28934883/contrast-enhanced-computed-tomography-enables-quantitative-evaluation-of-tissue-properties-at-intrajoint-regions-in-cadaveric-knee-cartilage
#10
Rachel C Stewart, Juuso T J Honkanen, Harri T Kokkonen, Virpi Tiitu, Simo Saarakkala, Antti Joukainen, Brian D Snyder, Jukka S Jurvelin, Mark W Grinstaff, Juha Töyräs
Objective The aim of this study was to investigate whether the concentration of the anionic contrast agent ioxaglate, as quantitated by contrast-enhanced computed tomography (CECT) using a clinical cone-beam CT (CBCT) instrument, reflects biochemical, histological, and biomechanical characteristics of articular cartilage imaged in an ex vivo, intact human knee joint. Design An osteoarthritic human cadaveric knee joint (91 years old) was injected with ioxaglate (36 mg I/mL) and imaged using CBCT over 61 hours of ioxaglate diffusion into cartilage...
October 2017: Cartilage
https://www.readbyqxmd.com/read/28934648/evaluation-of-tooth-root-surface-area-using-a-three-dimensional-scanning-technique-and-cone-beam-computed-tomographic-reconstruction-in-vitro
#11
Tong Wang, Xibo Pei, Feng Luo, Lingling Jia, Han Qin, Xinting Cheng, Yiyuan Xue, Jian Wang, Qianbing Wan
OBJECTIVE: To study the feasibility of measuring root surface area (RSA) by 3D scanning technique and cone beam computed tomography (CBCT) reconstruction in vitro. DESIGN: Twenty extracted teeth (10 single-rooted teeth and 10 multi-rooted teeth) were collected in this study. The RSA of the extracted teeth was measured by the membrane technique, 3D scanning technique, and CBCT reconstruction. A standard part was also designed to check the accuracy of each method...
July 21, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28932947/integration-of-digital-dental-casts-in-cone-beam-computed-tomography-scans-a-clinical-validation-study
#12
Frits A Rangel, Thomas J J Maal, Martien J J de Koning, Ewald M Bronkhorst, Stefaan J Bergé, Anne Marie Kuijpers-Jagtman
OBJECTIVES: Images derived from cone beam computed tomography (CBCT) scans lack detailed information on the dentition and interocclusal relationships needed for proper surgical planning and production of surgical splints. To get a proper representation of the dentition, integration of a digital dental model into the CBCT scan is necessary. The aim of this study was to validate a simplified protocol to integrate digital dental models into CBCT scans using only one scan. MATERIALS AND METHODS: Conventional protocol A used one combined upper and lower impression and two CBCT scans...
September 20, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28932139/predictability-of-bone-density-at-posterior-mandibular-implant-sites-using-cone-beam-computed-tomography-intensity-values
#13
Mustafa Alkhader, Malik Hudieb, Yousef Khader
OBJECTIVE: The aim of this study was to investigate the predictability of bone density at posterior mandibular implant sites using cone-beam computed tomography (CBCT) intensity values. MATERIALS AND METHODS: CBCT cross-sectional images for 436 posterior mandibular implant sites were selected for the study. Using Invivo software (Anatomage, San Jose, California, USA), two observers classified the bone density into three categories: low, intermediate, and high, and CBCT intensity values were generated...
July 2017: European Journal of Dentistry
https://www.readbyqxmd.com/read/28931867/accuracy-and-reliability-of-cone-beam-computed-tomography-for-linear-and-volumetric-mandibular-condyle-measurements-a-human-cadaver-study
#14
Verónica García-Sanz, Carlos Bellot-Arcís, Virginia Hernández, Pedro Serrano-Sánchez, Juan Guarinos, Vanessa Paredes-Gallardo
The accuracy of Cone-Beam Computed Tomography (CBCT) on linear and volumetric measurements on condyles has only been assessed on dry skulls. The aim of this study was to evaluate the reliability and accuracy of linear and volumetric measurements of mandibular condyles in the presence of soft tissues using CBCT. Six embalmed cadaver heads were used. CBCT scans were taken, followed by the extraction of the condyles. The water displacement technique was used to calculate the volumes of the condyles and three linear measurements were made using a digital caliper, these measurements serving as the gold standard...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28931768/study-of-hepatic-artery-cone-beam-imaging-by-low-rate-injection-in-iodinated-contrast-agent
#15
Mitsuru Osawa, Tadafumi Takano, Akihiko Hanawa, Yasuhiro Minami, Hiroshi Miura
PURPOSE: CT during hepatic arteriography (CTHA) of cone-beam computed tomography (CBCT) provides valid information in performing transcatheter arterial chemo-embolization (TACE). The usefulness of CTHA with the diluted contrast medium has been reported in some medical conferences. However, the operation becomes somehow complicated for the medical institutions that have angiography injectors with a single head. In this study, we aimed to investigate the clinical equivalence of low-rate injection method and diluted injection method...
2017: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/28931343/impact-of-bowel-gas-and-body-outline-variations-on-total-accumulated-dose-with-intensity-modulated-proton-therapy-in-locally-advanced-cervical-cancer-patients
#16
Thomas Berger, Jørgen Breede Baltzer Petersen, Jacob Christian Lindegaard, Lars Ulrik Fokdal, Kari Tanderup
INTRODUCTION: Density changes occurring during fractionated radiotherapy in the pelvic region may degrade proton dose distributions. The aim of the study was to quantify the dosimetric impact of gas cavities and body outline variations. MATERIAL AND METHODS: Seven patients with locally advanced cervical cancer (LACC) were analyzed through a total of 175 daily cone beam computed tomography (CBCT) scans. Four-beams intensity-modulated proton therapy (IMPT) dose plans were generated targeting the internal target volume (ITV) composed of: primary tumor, elective and pathological nodes...
September 21, 2017: Acta Oncologica
https://www.readbyqxmd.com/read/28927954/systematic-three-dimensional-analysis-of-wafer-based-maxillary-repositioning-procedures-in-orthognathic-surgery
#17
Timo Dreiseidler, Max-Philipp Lentzen, Matthias Zirk, Ali-Farid Safi, Joachim E Zoeller, Matthias Kreppel
PURPOSE: Little is known about the three-dimensional (3D) transfer accuracy in maxillary repositioning procedures based on conventionally manufactured dental-mounted wafers. The purpose of the present study was a systematic 3D analysis for wafer-based maxillary positioning in orthognathic surgery. MATERIALS AND METHODS: A total of 92 patients underwent Le Fort I in addition to mandibular bilateral sagittal split osteotomies (BSSO). Alignment of the pre- and postsurgical CBCT data sets allowed measuring maxillary position changes in axial, sagittal and transversal directions...
August 31, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28924570/implementation-and-ct-sampling-characterization-of-a-third-generation-spect-ct-system-for-dedicated-breast-imaging
#18
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/28920140/frequency-location-and-association-with-dental-pathology-of-mucous-retention-cysts-in-the-maxillary-sinus-a-radiographic-study-using-cone-beam-computed-tomography-cbct
#19
Andy Wai Kan Yeung, Ray Tanaka, Pek-Lan Khong, Thomas von Arx, Michael M Bornstein
OBJECTIVES: The purpose of the present study was to evaluate the frequency, locations, and dimensions of mucous retention cysts of the maxillary sinus and analyze potential associated dental pathology. MATERIALS AND METHODS: A total of 156 cone beam computed tomography (CBCT) scans were included in the analysis, resulting in an evaluation of 310 maxillary sinuses. The presence of mucous retention cysts (MRC) manifesting as dome-shaped radiopacities in the sinus was diagnosed...
September 17, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28920111/interpretation-of-cone-beam-computed-tomography-volumetric-data-how-to-report-findings
#20
Mel Mupparapu, Adriana G Creanga, Steven R Singer
Cone beam computed tomography (CBCT) was introduced to the dental profession at the beginning of the new millennium and has become an integral part of dental practice, especially within the surgical specialties. With advances in technology and the introduction of new-generation digital detectors, the concomitant increase in pixel resolution provided the ability to discern fine details of the anatomy. This article focuses on the methodology of CBCT interpretation and reporting. Details of reviewing the volume thoroughly are described with relevant citations...
2017: Quintessence International
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