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Dento Maxillo Facial Radiology

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https://www.readbyqxmd.com/read/28059563/resolution-characteristics-of-optical-coherence-tomography-for-dental-use
#1
Hiroshi Watanabe, Ami Kuribayashi, Yasunori Sumi, Tohru Kurabayashi
OBJECTIVES: The purpose of this study was to clarify resolution characteristics of optical coherence tomography (OCT) for dental use. METHODS: Two types of swept-source OCT machines (SS-OCTs) were employed in this study. To clarify their resolution characteristics, we newly developed a glass chart device with a ladder pattern of wavelengths, which ranged from (4 x 2) µm to (1024 x 2) µm, as well as a star-target pattern, a grid pattern, and a spatial frequency response pattern...
January 6, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28059562/spatial-and-contrast-resolution-of-ultralow-dose-dentomaxillofacial-ct-imaging-using-iterative-reconstruction-technology
#2
Gerlig Widmann, Alexander Bischel, Andreas Stratis, Hilde Bosmans, Reinhilde Jacobs, Eva-Maria Gassner, Wolfgang Puelacher, Ruben Pauwels
OBJECTIVE: The objective of this study was to determine how iterative reconstruction technology (IRT) influences contrast and spatial resolution in ultralow dose dentomaxillofacial computed tomography (CT) imaging. METHODS: A polymethyl methacrylate phantom with various inserts was scanned using a reference protocol at CTDIvol 36.56 mGy, a sinus protocol at 18.28 mGy, and ultralow dose protocols at 4.17, 2.36, 0.99, and 0.53 mGy. All datasets were reconstructed using filtered back projection (FBP) and the following IRTs: adaptive statistical iterative reconstructions (ASIR-50, ASIR-100), and model-based iterative reconstruction (MBIR)...
January 6, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28045346/utility-of-fusion-volumetric-images-from-computed-tomography-and-magnetic-resonance-imaging-for-localizing-the-mandibular-canal
#3
Chutamas Deepho, Hiroshi Watanabe, Shinya Kotaki, Junichiro Sakamoto, Yasunori Sumi, Tohru Kurabayashi
OBJECTIVES: The purpose of this study is to investigate whether computed tomography/magnetic resonance imaging (CT/MRI) fusion volumetric images can improve the detectability of the mandibular canal (MC) compared to CT alone. METHODS: Images of 31 lesions within or close to the mandible using both multi-slice CT (MSCT) and MRI were gathered from our imaging archives. All lesions underwent MSCT and three dimensional volumetric interpolated breath-hold examination (3D-VIBE) MRI...
January 3, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28045345/quality-assurance-phantoms-for-cone-beam-computed-tomography-a-systematic-literature-review
#4
Marcus Vinicius Linhares de Oliveira, Ann Wenzel, Paulo Sergio Flores Campos, Rubens Spin-Neto
OBJECTIVE: To undertake a systematic review on quality assurance phantoms for CBCT imaging, including studies on development and application of the phantoms. METHODS: The MEDLINE (PubMed) bibliographic database was searched until May 2016 for studies evaluating the development and use of phantoms in CBCT image quality assurance. The search strategy was restricted to English-language publications using the following combined terms: (Cone Beam CT) OR (Cone Beam Computed Tomography) OR (Cone-Beam Computed Tomography) OR (CBCT) AND (quality OR phantom)...
January 3, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28045344/contrast-enhanced-ultrasound-mapping-of-sentinel-lymph-nodes-in-oral-tongue-cancer-a-pilot-study
#5
Gvetadze R Shalva, P Xiong, Mingming Lv, J Li, J Hu, Konstantin Ilkaev, Xin Yang, Jian Sun
OBJECTIVES: To assess the usefulness of contrast-enhanced ultrasound with peritumoral injection of microbubble contrast agent for detecting the sentinel lymph nodes for oral tongue carcinoma. METHODS: Preliminary study, case series. The study was carried out on 12 patients withT1-2cN0 oral tongue cancer. A radical resection of the primary disease was planned, a modified radical supraomohyoid neck dissection was reserved for patients owing larger lesions (T2, n=8)...
January 3, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28045343/a-new-method-to-evaluate-image-quality-of-cbct-images-quantitatively-without-observers
#6
Yohei Takeshita, Mayumi Shimizu, Kazutoshi Okamura, Shoko Yoshida, Warangkana Weerawanich, Kenji Tokumori, Gainer Jasa, Kazunori Yoshiura
OBJECTIVES: To develop an observer-free method for quantitatively evaluating the image quality of CBCT images by applying just-noticeable difference (JND). METHODS: We used two test objects: (1) a Teflon (polytetrafluoroethylene) plate phantom attached to a dry human mandible; and (2) a block phantom consisting of a Teflon step phantom and an aluminum step phantom. These phantoms had holes with different depths. They were immersed in water and scanned with a CB MercuRay at tube voltages of 120, 100, 80, and 60 kV...
January 3, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27996305/infection-control-and-patient-discomfort-with-an-alternative-plastic-barrier-in-intraoral-digital-radiography
#7
Arnon Charuakkra, Sangsom Prapayasatok, Apirum Janhom, Karune Verochana, Phattaranant Mahasantipiya
OBJECTIVE: 1) to compare the efficacy of a commercially-available hygienic sheath and an alternative plastic bag in preventing contamination of the imaging plate during intraoral radiography, and 2) to compare patient discomfort when using the hygienic sheath and the plastic bag. METHODS: Sixty sterilized size 2 imaging plates covered with either the hygienic sheath (n = 30) or the plastic bag (n = 30) were used to simulate digital periapical radiographic examination in 30 volunteer patients...
December 20, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27990846/are-different-imaging-methods-affecting-the-treatment-decision-of-extractions-of-mandibular-third-molars
#8
Yifat Manor, Refael Abir, Alex Manor, Israel Kaffe
OBJECTIVES: To find the differences between treatment decisions of lower impacted third molars among experts of oral and maxillofacial surgery according to panoramic radiographic and CBCT findings. METHODS: A retrospective analysis of 62 panoramic radiographs and CBCT of lower third molars evaluated for treatment decisions by 9 independent experts of oral and maxillofacial surgery. RESULTS: Differences in interpretation of the panoramic radiography were found between surgeons...
December 18, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27936919/t2-relaxation-mapping-mri-of-healthy-and-inflamed-gingival-tissue
#9
Rexford D Newbould, Courtney A Bishop, Robert L Janiczek, Charles Parkinson, Francis J Hughes
OBJECTIVE: To investigate the use and reproducibility of MRI transverse relaxation time (T2) mapping in healthy and inflamed gingivae. METHODS: Twenty one subjects were recruited into two groups: those without evidence of gingivitis ('healthy', n=11, age=24.0 ±3.66) by visual assessment and those with moderate to severe gingivitis ('gingivitis', n=10, age=28.9 ±6.03) exhibited across the second mandibular premolar and first mandibular molar buccal gingivae. Subjects were imaged by MRI twice in a single day...
December 12, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27936917/imaging-findings-of-childhood-b-cell-lymphoblastic-lymphoma-in-the-mental-region-a-case-report
#10
Phong Dai Lam, Ami Kuribayashi, Junichiro Sakamoto, Shin Nakamura, Hiroyuki Harada, Tohru Kurabayashi
Lymphoblastic lymphoma (LBL) is an uncommon neoplasm that accounts for about 5% of all non-Hodgkin's lymphomas. Approximately 90% of LBLs are of immature T-cell lineage, with B-cell lymphoblastic lymphoma (B-LBL) accounting for only about 10%. Due to the infrequency, the clinicopathological features and the imaging findings of B-LBL are not well defined. LBLs frequently affect extranodal sites. The most common site is skin, followed by bone, and the head and neck region is rarely involved. We report herein a case of childhood B-LBL occurring in the mental region, with emphasis on the findings of several imaging studies, including contrast-enhanced CT, MRI and FDG-PET/CT...
December 12, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27936914/characteristic-features-of-odontogenic-myxoma-on-cone-beam-computed-tomography
#11
Kaili Wang, Wenhao Guo, Meng You, Li Liu, Bei Tang, Guangning Zheng
OBJECTIVES: To illustrate characteristic features of odontogenic myxoma (OM) on CBCT. METHODS: From fifty-two subjects with histopathologically diagnosed odontogenic myxomas, eighteen that underwent CBCT examination were retrieved between May 2009 and April 2016. Features on CBCT images and clinical records were carefully observed and analyzed. RESULTS: Characteristic features include: (1) Fine and straight septa were recognized to separate the tumor into triangular, square or rectangular spaces which appeared as "tennis racket" or "honeycomb" patterns; (2) Septa frequently scattered to the borders of lesions and appeared perpendicular to the margins; (3) Tooth displacement and resorption were seen in most of OM lesions; (4) OMs were noted to have a tendency to involve the alveolar process, scalloped between the roots, and affected the integrity of the alveolar ridge; (5) The cortex of OMs appeared normally perforated and the edge of the cortex expanded into the soft tissue...
December 12, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27910719/artifacts-in-multimodal-imaging-of-titanium-zirconium-and-binary-titanium-zirconium-alloy-dental-implants-an-in-vitro-study
#12
Ralf Smeets, Maximilian Schöllchen, Tobias Gauer, Gahzal Aarabi, Alexandre T Assaf, Carsten Rendenbach, Benedicta Beck-Broichsitter, Jan Semmusch, Jan Sedlacik, Max Heiland, Jens Fiehler, Susanne Siemonsen
OBJECTIVES: To analyze and evaluate imaging artifacts induced by zirconium, titanium and titanium-zirconium alloy dental implants. METHODS: Zirconium, titanium and titanium-zirconium alloy implants were embedded in gelatin and MRI, CT and CBCT were performed. Standard-protocols were used for each modality. For MRI, line-distance-profiles were plotted to quantify the accuracy of size-determination. For CT and CBCT, six shells surrounding the implant were defined every 0...
December 2, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27910717/dose-optimisation-for-assessment-of-periodontal-structures-in-cone-beam-ct-examinations
#13
Ayman Al-Okshi, Chrysoula Theodorakou, Christina Lindh
OBJECTIVE: To investigate the relationship between dose and image quality for a dedicated dental Cone Beam CT (CBCT) scanner using different scanning protocols and to set up an optimal imaging protocol for assessment of periodontal structures. METHODS: Radiation dose and image quality measurements were made using the 3D Accuitomo 170 dental CBCT scanner. The SedentexCT IQ phantom was used to investigate the relationship between contrast-to-noise ratio (CNR) and dose-area product (DAP)...
December 2, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27910700/evaluation-of-a-metal-artefact-reduction-tool-on-different-positions-of-a-metal-object-in-the-fov
#14
Polyane M Queiroz, Gustavo M Santaella, Thais D J da Paz, Deborah Q Freitas
OBJECTIVE: To evaluate the action of a metal artefact reduction tool when artefact-generator metal object is on different positions in the field of view (FOV). METHODS: A cylindrical utility wax phantom with a metal alloy sample inside was made. The phantom was positioned centrally and peripherally in the FOV for image acquisition, with and without the metal artefact reduction tool activation. Standard deviation values (image noise levels) from areas around the metal sample and the control area were obtained...
December 2, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27883287/definition-classification-and-retrospective-analysis-of-photostimulable-phosphor-image-artefacts-and-errors-in-intraoral-dental-radiography
#15
Armagan Caliskan, Ayse Pinar Sumer
OBJECTIVES: To detect and determine image error and artefact types in intraoral radiographs obtained with PSP technology, place them in an appropriate classification and retrospectively analyse the PSP specific image errors and artefacts. The causes and solutions of PSP specific errors and artefacts have also been discussed. METHODS: The radiographic database of the Ondokuz Mayıs University, Faculty of Dentistry, Department of Dentomaxillofacial Radiology was used for this study...
November 24, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27844482/conditions-and-calibration-to-obtain-comparable-gray-values-between-different-clinical-cone-beam-computed-tomography-scanners
#16
Gregory M England, Eun-Sang Moon, Jordan Roth, Toru Deguchi, Allen R Firestone, F Michael Beck, Do-Gyoon Kim
OBJECTIVES: The objective of the current study was to examine the gray value parameters and their magnitudes produced by cone beam computed tomography (CBCT) and whether they are influenced by different scanners with various scanning conditions. METHODS: ATOM Max dental and diagnostic artificial head was scanned by two CBCT scanners (Planmeca and iCAT). Under full field of view with a normal dose and an ultra-low dose (ULD) conditions, Planmeca examined for 3 scanning resolutions (200, 400, and 600 micron voxel sizes) and iCAT scanners tested for 4 scanning resolutions (200, 250, 300 and 400 micron voxel sizes)...
November 15, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27808559/correction-to-intraoral-versus-extraoral-bitewing-radiography-in-detection-of-enamel-proximal-caries-an-ex-vivo-study
#17
(no author information available yet)
No abstract text is available yet for this article.
November 3, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27786566/detection-of-vertical-root-fractures-in-intact-and-endodontically-treated-premolar-teeth-by-designing-a-probabilistic-neural-network-an-ex-vivo-study
#18
Masume Johari, Farzad Esmaeili, Alireza Andalib, Shabnam Garjani, Hamidreza Saberkari
OBJECTIVE: Detection of vertical root fractures (VRF) in their initial stages is a crucial issue which prevents the propagation of injury to the adjacent supporting structures. Designing a suitable neural network based model could be a useful method to diagnose the VRFs. The aim of this study was to design a probabilistic neural network to diagnose the vertical root fractures in intact and endodontically treated teeth of periapical and CBCT radiographs. Also, we have compared the efficacy of these two imaging techniques in the detection of VRFs...
October 27, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27786564/detection-of-patient-movement-during-cbct-examination-using-video-observation-compared-with-an-accelerometer-gyroscope-tracking-system
#19
Rubens Spin-Neto, Louise Hauge Matzen, Lars Wisti Schropp, Erik Gotfredsen, Ann Wenzel
OBJECTIVE: Compare video observation (VO) with a novel three-dimensional registration method, based on an accelerometer-gyroscope (AG) system, to detect patient movement during CBCT examination. The movements were further analyzed according to complexity and patient's age. METHODS: 181 patients (118 female/63 male; age average 30 years, range: 9-84), in whom 206 CBCT examinations were performed, were video-recorded during examination. An AG was at the same time attached to the patient's head to track head position in three dimensions...
October 27, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27786556/high-resolution-mri-of-the-mandibular-canal-at-1-5t-a-comparison-of-gradient-and-spin-echo-sequences
#20
Jakob Kreutner, Andreas Hopfgartner, Daniel Weber, Julian Boldt, Kurt Rottner, Ernst Richter, Peter Michael Jakob, Daniel Haddad
OBJECTIVES: The precision of localizing the mandibular canal prior to surgical intervention depends on the achievable resolution, while identification of the nerve depends on the image contrast. In our study we developed new protocols based on gradient and spin echo sequences. The results from both sequences were quantitatively compared for their agreement to identify the most suitable approach. METHODS: By limiting the field of view to one side of the mandible, 3D acquisitions with T1-weighted gradient and spin echo sequences were performed with 0...
October 27, 2016: Dento Maxillo Facial Radiology
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