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D Messineo, S Masieri, C Cavaliere
Rhinitis is an underestimated clinical condition, which has a considerable impact on the quality of life of the affected patients. The subject of this review focuses on three fundamental aspects: the development of knowledge concerning anatomic landmarks, the development of radiological imaging technology, and developments that can make a difference in the treatment of allergic rhinitis. The anatomical study of paranasal sinuses has been conducted since the time of the ancient Egyptians. Development of radiological equipment from the early 1900s has helped to improve information on the morphology of paranasal sinuses, sufficient to be considered valuable information regarding frontal anatomy and its variability...
January 2018: Journal of Biological Regulators and Homeostatic Agents
Shi Kang Wong, Pravinkumar G Patil
STATEMENT OF PROBLEM: The inferior alveolar nerve (IAN) frequently loops backward before exiting from the mental foramen and spreads several millimeters medially to the foramen. Implant placement in this area may damage the nerve if the anterior loop area is not carefully identified in a radiographic or computed tomography (CT) evaluation. PURPOSE: The purpose of this observational study was to measure the prevalence of the presence of the anterior loop and to estimate sex and ethnicity-related variations in anterior loop length in the Malaysian population...
March 15, 2018: Journal of Prosthetic Dentistry
Sompop Bencharit, Adam Staffen, Matthew Yeung, Daniel Whitley, Daniel M Laskin, George R Deeb
PURPOSE: Desktop stereolithographic printers combined with intraoral scanning and implant planning software promise precise and cost-effective guided implant surgery. The purpose of the present study was to determine the overall range of accuracy of tooth-supported guided implant surgery using desktop printed stereolithographic guides. MATERIALS AND METHODS: A cross-sectional study comparing fully and partially guided implant surgery was conducted. Preoperative cone beam computed tomography (CBCT) and intraoral scans were used to plan the implant sites...
February 21, 2018: Journal of Oral and Maxillofacial Surgery
Salahaddin Zahedi, Maryam Mostafavi, Neda Lotfirikan
INTRODUCTION: The present study aimed to anatomically assess mandibular posterior teeth using cone-beam computed tomographic (CBCT) imaging for endodontic surgery. METHODS: A total of 170 CBCT scans were evaluated for anatomic variations of mandibular posterior teeth. All the scans were obtained using a Planmeca Promax CBCT unit (Planmeca, Helsinki, Finland) with exposure settings of 90 kVp, 12 mA, 12 seconds, and 0.3-mm resolution. All CBCT images were reconstructed by Romexis Viewer 3...
March 14, 2018: Journal of Endodontics
Unni Krishnan, Paul Monsour, Khaleel Thaha, Ratilal Lalloo, Alex Moule
INTRODUCTION: The aim of this retrospective observational study was to evaluate the cone-beam computed tomographic (CBCT)-based characteristics of the mental foramen (MF), accessory mental foramen (AMF), anterior loop (AL), lateral lingual foramen (LLF), lateral lingual canal (LLC) and to explore any relationships between their characteristics. METHODS: The location and dimension of the MF; the incidence, location, and dimension of the AMF along with its distance to the MF; the presence and dimension of the AL; and the presence, location, angle of entry of the LLF and LLC, and its relation with the mandibular canal (MC) were evaluated in 109 CBCT scans...
March 14, 2018: Journal of Endodontics
Cole W Barnett, Gerald N Glickman, Mikhail Umorin, Poorya Jalali
INTRODUCTION: Accurate radiographic interpretation is of the utmost importance in the diagnosis and treatment of patients. Previous studies have indicated subjectivity in the radiographic interpretation of periapical tissues irrespective of using conventional radiography, digital radiography, or cone-beam computed tomographic (CBCT) imaging. No studies to date have evaluated the reliability of the interpretation of periapical tissues based on the size of periapical radiolucency (PAR)...
March 14, 2018: Journal of Endodontics
Umut Aksoy, Kaan Orhan
OBJECTIVES: This study aimed to assess the maxillary sinus mucosal thickening and to associate them with odontogenic conditions using cone-beam computed tomographic (CBCT) images. MATERIALS AND METHODS: CBCT images of 294 patients (143 female, 151 males; age range 18-78 years) with 588 maxillary sinuses were evaluated retrospectively. The anatomic relationship between maxillary sinuses and teeth was determined and classified. The presence of root canal fillings and the periapical lesions of these teeth was also recorded...
March 17, 2018: Clinical Oral Investigations
Daniel B Rodrigues, Paulo S F Campos, Larry M Wolford, Jaqueline Ignácio, João R Gonçalves
PURPOSE: Maxillary segmentation involving interdental osteotomies can have an adverse effect on the interdental crestal bone and adjacent teeth. The purpose of the present study was to evaluate the effect of interdental osteotomies on surrounding osseous and dental structures, including adjacent teeth, using cone beam computed tomography (CBCT), in patients who underwent segmental maxillary osteotomies. PATIENTS AND METHODS: The present retrospective cohort study evaluated interdental osteotomy (IDO) sites between the lateral incisors and canines in patients treated with 3-piece Le Fort I osteotomies...
February 19, 2018: Journal of Oral and Maxillofacial Surgery
Seval Bayrak, Emine Şebnem Kurşun-Çakmak, Cemal Atakan, Kaan Orhan
OBJECTIVES: The goal of this retrospective study is to evaluate the radiologic anatomy of sphenoidal emissary foramen (SEF) by using cone-beam computed tomography (CBCT) scans. METHODS: Three hundred seventeen (189 female and 128 male) full-head CBCT images were evaluated in this study. Incidence, diameter, shape, confluence to foramen ovale, and distance to anatomic structures of SEF were noted. RESULTS: In the 317 analyzed images, the SEF was identified in 89 (28...
March 14, 2018: Journal of Craniofacial Surgery
Nathan Cho, Panagiotis Tsiamas, Esteban Velarde, Erik Tryggestad, Robert Jacques, Ross Berbeco, Todd McNutt, Peter Kazanzides, John Wong
PURPOSE: The Small Animal Radiation Research Platform (SARRP) has been developed for conformal micro irradiation with on-board cone-beam CT (CBCT) guidance. The graphics processing unit (GPU)-accelerated Superposition-Convolution (SC) method for dose computation has been integrated into the treatment planning system (TPS) for SARRP. This paper describes the validation of the SC method for the kilovoltage energy by comparing with EBT2 film measurements and Monte Carlo (MC) simulations...
March 15, 2018: Medical Physics
Georg Böning, Willie M Lüdemann, Julius Chapiro, Martin Jonczyk, Bernd Hamm, Rolf W Günther, Bernhard Gebauer, Florian Streitparth
PURPOSE: The aim of this study was to evaluate the feasibility of cone-beam computed tomography (CBCT)-based real-time 3-D guidance of TIPSS placement and its positioning compared to standard guiding methods. MATERIALS AND METHODS: In a prospective, randomized, consecutive study design from 2015 to 2017, we included 21 patients in the CBCT guided group and 15 patients in the ultrasound (US) guided group. The prospective groups were compared in terms of success rate of intervention, portal vein puncture/procedure time, number of puncture attempts and applied dose...
March 14, 2018: Cardiovascular and Interventional Radiology
Robin De Roover, Wouter Crijns, Kenneth Poels, Ronald Peeters, Cédric Draulans, Karin Haustermans, Tom Depuydt
PURPOSE: Liquid fiducial markers have shown to be a promising alternative to solid gold markers in terms of imaging artifact reduction, patient comfort and compatibility with different imaging modalities. This study aims to investigate the performance of the novel BioXmark® liquid marker for state-of-the-art multi-modal imaging used in prostate cancer (PCa) radiotherapy, encompassing kV CT/CBCT, multi-parametric MRI and kV X-ray imaging. In addition, automatic detection of the liquid markers in X-ray imaging for prostate motion monitoring during treatment was investigated...
March 14, 2018: Medical Physics
Yingxuan Chen, Fang-Fang Yin, Yawei Zhang, You Zhang, Lei Ren
Compressed sensing reconstruction using total variation (TV) tends to over-smooth the edge information by uniformly penalizing the image gradient. The goal of this study is to develop a novel prior contour based TV (PCTV) method to enhance the edge information in compressed sensing reconstruction for CBCT. 
 Methods: The edge information is extracted from prior planning-CT via edge detection. Prior CT is first registered with on-board CBCT reconstructed with TV method through rigid or deformable registration...
March 14, 2018: Physics in Medicine and Biology
Rubens Spin-Neto, Louise H Matzen, Lars W Schropp, Thomas S Sørensen, Ann Wenzel
OBJECTIVES: To assess the impact of head motion artefacts and an automated artefact-correction system on CBCT image quality and interpretability for simulated diagnostic tasks. METHODS: A partially dentate human skull was mounted on a robot simulating four types of head movement (antero-posterior translation, nodding, lateral rotation, and tremor), at three distances (0.75, 1.5, and 3 mm) based on two movement patterns (skull returning/not returning to the initial position)...
March 14, 2018: Dento Maxillo Facial Radiology
Hussam Alfawaz, Abdullah Alqedairi, Abdulrahman K Alkhayyal, Abdulaziz A Almobarak, Mohannad F Alhusain, Jorge N R Martins
OBJECTIVES: The purpose of this study was to determine the prevalence of the C-shaped root canal configuration, location of the longitudinal groove, sex differences, and unilateral/bilateral presence in mandibular first and second molars in a Saudi population using cone beam computed tomography (CBCT). MATERIALS AND METHODS: CBCT images for the mandibular first and second molars of 487 patients (a total of 529 first molars and 681 s molars) were evaluated. The teeth were assessed for the presence of C-shaped root canals according to Fan criteria...
March 13, 2018: Clinical Oral Investigations
Mehrdad Abdinian, Maedeh Aminian, Samad Seyyedkhamesi
Objectives: Foreign bodies (FBs) account for 3.8% of all pathologies of the head and neck region, and approximately one third of them are missed on initial examination. Thus, FBs represent diagnostic challenges to maxillofacial surgeons, rendering it necessary to employ an appropriate imaging modality in suspected cases. Materials and Methods: In this cross-sectional study, five different materials, including wood, metal, glass, tooth and stone, were prepared in three sizes (0...
February 2018: Journal of the Korean Association of Oral and Maxillofacial Surgeons
Masoumeh Johari, Milad Abdollahzadeh, Farzad Esmaeili, Vahideh Sakhamanesh
Background: Dental cone beam computed tomography (CBCT) images suffer from severe metal artifacts. These artifacts degrade the quality of acquired image and in some cases make it unsuitable to use. Streaking artifacts and cavities around teeth are the main reason of degradation. Methods: In this article, we have proposed a new artifact reduction algorithm which has three parallel components. The first component extracts teeth based on the modeling of image histogram with a Gaussian mixture model...
January 2018: Journal of Medical Signals and Sensors
Darren R Feldman, Shirin Ardeshir-Rouhani-Fard, Patrick Monahan, Howard D Sesso, Chunkit Fung, Annalynn M Williams, Robert J Hamilton, David J Vaughn, Clair J Beard, Ryan Cook, Mohammad Abu Zaid, Steven E Lipshultz, Lawrence H Einhorn, Kevin C Oeffinger, Lois B Travis, Sophie D Fossa
BACKGROUND: Testicular cancer survivors (TCSs) are at increased risk of cardiovascular disease (CVD) after cisplatin-based chemotherapy (CBCT). Identifying at-risk survivors would allow early intervention, but risk prediction tools such as the Framingham Risk Score (FRS) have not been applied to TCSs given modern chemotherapy. METHODS: TCSs > 1 year post-CBCT were evaluated. Associations between FRS and clinical, socioeconomic, and lifestyle measures and treatment regimen (4 cycles, etoposide and cisplatin [EP × 4]); 3 or 4 cycles, bleomycin plus EP (BEP × 3, BEP × 4) were analyzed with general linear multivariable models...
February 5, 2018: Clinical Genitourinary Cancer
Jan Brandt, Martin Brenner, Hans-Christoph Lauer, Silvia Brandt
PURPOSE: The aim of this in vitro study was to evaluate the accuracy of template-guided implantation planned with implant-planning software (Implant Studio), comparing computer-aided design/computer-assisted manufacture (CAD/CAM)-based measurements with measurements via cone beam computed tomography (CBCT). MATERIALS AND METHODS: Thirty template-guided implantations were planned and performed on acrylic-resin models. The implant positions were detected with an intraoral scanner, evaluated with CAD quality-control software, and compared with the planned positions in the test group...
March 2018: International Journal of Oral & Maxillofacial Implants
Mark C Lawlor, Melissa A Kluczynski, John M Marzo
BACKGROUND: The utility of computed tomography (CT) for measuring medial clear space (MCS) for determination of the stability of supination external rotation (SER) ankle fractures and in comparison to standard radiographs is unknown. We compared MCS on gravity stress (GS) radiographs to GS and weight bearing (WB) cone-beam CT (CBCT). METHODS: An AO SER 44B3.1 ankle fracture was simulated in 10 human cadavers, also serving as controls. MCS was measured on GS radiographs, GS CBCT, and a simulated WB CBCT scan...
March 1, 2018: Foot & Ankle International
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