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Dento Maxillo Facial Radiology

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https://www.readbyqxmd.com/read/30633558/diagnostic-abilities-of-3t-mri-for-assessing-mandibular-invasion-of-squamous-cell-carcinoma-in-the-oral-cavity-comparison-with-64-row-multidetector-ct
#1
Noriko Suzuki, Ami Kuribayashi, Kei Sakamoto, Junichiro Sakamoto, Shin Nakamura, Hiroshi Watanabe, Hiroyuki Harada, Tohru Kurabayashi
OBJECTIVES: To evaluate the diagnostic accuracies of 3T MRI in evaluating mandibular invasion of squamous cell carcinoma (SCC) in the oral cavity and to compare those with that of multidetector CT (MDCT). METHODS: 41 cases with oral SCC examined by both 3T MRI and MDCT prior to surgery were included in this study. Intravenous contrast medium was administered in all examinations. Images were evaluated for the presence or absence of mandibular invasion and mandibular canal involvement by the tumour...
January 11, 2019: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30633546/cbct-characteristics-and-interpretation-challenges-of-temporomandibular-joint-osteoarthritis-in-a-hand-osteoarthritis-cohort
#2
Margareth Kristensen Ottersen, Anna-Karin Abrahamsson, Tore Arne Larheim, Linda Zamoline Arvidsson
OBJECTIVES: To characterize osteoarthritis (OA) in the temporomandibular joints (TMJs) by means of cone beam computed tomography (CBCT) in a hand OA population, and identify interpretation challenges. METHODS: The TMJs of 54 individuals (mean age 71.3) recruited from the "The Oslo hand OA cohort", independently of TMJ related symptoms, were examined with CBCT (ProMax MidCBCT). Images were analyzed for bone change characteristics and each joint was diagnosed with either OA, no OA or as indeterminate for OA...
January 11, 2019: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30608183/undetectability-of-oral-tongue-cancer-on-magnetic-resonance-imaging-clinical-significance-as-a-predictor-to-avoid-unnecessary-elective-neck-dissection-in-node-negative-patients
#3
Akira Baba, Yumi Okuyama, Koshi Ikeda, Ayako Kozakai, Taiki Suzuki, Hirokazu Saito, Satoru Ogane, Shinji Yamazoe, Hideomi Yamauchi, Nobuhiro Ogino, Yuki Seto, Yuko Kobashi, Takuji Mogami, Hiroya Ojiri
METHODS: We retrospectively reviewed early stage oral tongue cancer patients treated with radical surgery with clinically N0, between May 2009 and February 2016. Collected data include age, sex, pathological DOI, DOI on MRI, locoregional control rate, disease-free survival rate, and overall survival rate. These data were statistically compared between the detectable lesion (DL) group and undetectable lesion (UL) group on MRI. Interobserver agreement in evaluation of detectability of the oral tongue cancer was assessed by k statistics...
January 4, 2019: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30604650/the-development-of-new-image-receptor-holding-instruments-with-appropriate-horizontal-x-ray-beam-angulation-for-periapical-radiographs
#4
Peerapong Wamasing, Hiroshi Watanabe, Yumi Tsuchida, Naoto Ohbayashi, Tetsuya Suzuki, Tohru Kurabayashi
OBJECTIVE: This study aimed to develop new image receptor-holding instruments with appropriate horizontal X-ray beam angulation, based on the anatomical data of posterior region interproximal surfaces derived from archived computed tomography (CT) images. METHODS: CT images of 92 patients with sound upper and lower dental arches were collected from our CT database and analyzed to determine the angles between the tangential interproximal contact line and the central groove line of posterior teeth...
January 3, 2019: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30604638/differentiation-between-solitary-fibrous-tumors-and-schwannomas-of-the-head-and-neck-an-apparent-diffusion-coefficient-histogram-analysis
#5
Author Names, Natsuko Kunimatsu, Akira Kunimatsu, Koki Miura, Ichiro Mori, Shigeru Nawano
OBJECTIVES: We sought to elucidate the differences between solitary fibrous tumors (SFTs) and schwannomas in the head and neck by apparent diffusion coefficient (ADC) histogram analyses. METHODS: Our study included five patients with SFT and 18 patients with schwannoma in the head and neck region for whom preoperative ADC images were obtained using either 1.5  T or 3.0  T MRI system with two b values. An ADC image that showed the tumor at the largest major diameter was selected for each patient, and a region of interest (ROI) was set circumscribing the tumor...
January 3, 2019: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30604636/image-quality-optimization-using-a-narrow-vertical-detector-dental-cone-beam-ct
#6
Danieli Moura Brasil, Ruben Pauwels, Wim Coucke, Francisco Haiter-Neto, Reinhilde Jacobs
METHODS: Clinical (CL) and quantitative (QUANT) evaluations of image quality were performed using an anthropomorphic phantom. Technical (TECH) evaluation was performed with a polymethyl methacrylate phantom. Images were obtained using a PaX-i3D Green CBCT (Vatech, Hwaseong, Korea) device, with a large 21 × 19  and a medium 12 × 9  cm field of view (FOV), and high-dose (HD-ranging from 85 to 110 kV) and low-dose (LD-ranging from 75 to 95 kV) protocols, totalling four groups (21 × 19  cm HD, 21 × 19  cm LD, 12 × 9  cm HD, 12 × 9  cm LD)...
January 3, 2019: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30604634/a-reject-analysis-of-cone-beam-computed-tomographies-in-under-aged-patients
#7
J W G Van Acker Jakob, Wolfgang Jaqcuet, Melissa Dierens, Luc Martens
OBJECTIVES: The main objective of this study was to perform a retrospective reject analysis (or audit) of 79 CBCTs taken in under-aged patients at the Ghent University hospital over a 2 year timespan. METHODS: Observer agreement between 2 oral radiologists and 2 senior year Master students in Paediatric Dentistry was performed for quality, diagnostic and therapeutic value. The senior year Master Students followed appropriate modules of an online course. Descriptive and comparative statistics were performed...
January 3, 2019: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30540920/re-exposure-in-cone-beam-ct-of-the-dentomaxillofacial-region-a-retrospective-study
#8
Yasamin Habibi, Edriss Habibi, Bilal Al-Nawas
METHODS: In a retrospective cohort study CBCT images of 4986 patients from the patient database from the Department of Oral Radiology, University Medical Center of the Johannes Gutenberg University, Mainz, Germany were included and the rate of re-exposures was counted. Patients were stratified into those who received a scan with the small field-of-view CBCT or the large field-of-view CBCT. The effect of patient-related parameters as age and gender was implicated. As a further device-specific parameter, the statistical analysis included whether the selection of the field of view due to the device type had a significant influence on the occurrence of re-exposures...
January 3, 2019: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30540916/can-a-high-density-dental-material-affect-the-automatic-exposure-compensation-of-digital-radiographic-images
#9
Neiandro Santos Galvão, Eduarda Helena Leandro Nascimento, Carlos Augusto Souza Lima, Deborah Queiroz Freitas, Francisco Haiter-Neto, Matheus Lima Oliveira
OBJECTIVES: To investigate the influence of high-density dental material on the automatic exposure compensation of digital radiographic imaging systems. METHODS: Two radiographic phantoms were custom made to reproduce radiographic densities of the dental tissues: enamel, dentin and pulp chamber. The phantoms were X-rayed using the Digora Toto, Digora Optime and VistaScan systems for 0.063, 0.1 and 0.16  s. Radiographic acquisitions were repeated in the presence of a high-density material equivalent to a titanium implant, in the small and large sizes...
January 3, 2019: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30563362/influence-of-scan-mode-partial-full-rotations-and-fov-size-in-the-formation-of-artefacts-in-cone-beam-computed-tomography
#10
Eliana Dantas da Costa, Polyane Mazucatto Queiroz, Gustavo Machado Santaella, Ana Lúcia Alvares Capelozza, Glaucia Maria Bovi Ambrosano, Deborah Queiroz Freitas
OBJECTIVE: To evaluate the influence of rotation degree and FOV size on the amount of artefacts produced in CBCT images. METHODS: A cylindrical wax utility phantom, with a metallic sample in its interior, was scanned with two FOV sizes (100 x 100 and 40 x 40 mm) and in full (360°) and partial (~180°) rotations. After the acquisitions, images were objectively assessed in the ImageJ software, obtaining the standard deviation in areas around the metal sample. The influence of artefacts produced by the several FOVs and rotation degrees was compared by two-way analysis of variance (ANOVA) (α=0...
December 19, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30540919/are-metal-artefact-reduction-algorithms-effective-to-correct-cone-beam-ct-artefacts-arising-from-the-exomass
#11
Amanda Pelegrin Candemil, Benjamin Salmon, Deborah Queiroz Freitas, Glaucia Maria Bovi Ambrosano, Francisco Haiter-Neto, Matheus Lima Oliveira
The aim of this study was to evaluate the effectiveness of metal artefact reduction (MAR) in cone beam computed tomography (CBCT) artefacts arising from metallic objects in the exomass. A radiographic phantom composed of 16 polypropylene tubes filled with a homogeneous radiopaque solution was created. CBCT scans were obtained with two units: Picasso Trio (Vatech, South Korea) and ProMax (Planmeca, Finland). The phantom was centred in a 5 × 5  cm field-of-view with titanium and CoCr inserts in the exomass...
December 12, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30426765/differential-diagnostic-value-of-diffusion-weighted-and-dynamic-contrast-enhanced-mr-imaging-in-non-cystic-lesions-in-floor-of-the-mouth
#12
Ying Yuan, Mengda Jiang, Lizhong Wu, Xiaofeng Tao
METHODS: A total of 82 patients were included in this study. The apparent diffusion coefficient (ADC) values and time-signal intensity curves (TICs) were measured. Clinical characteristics, ADC value, and TIC pattern were compared between benign and malignant FOM lesions. Receiver operating characteristic curve and logistic regression analyses were performed to evaluate respective and combined value of ADC value and TIC pattern for differential diagnosis. The retrospective study was approved by our institutional review board, and the need for informed consent was waived...
November 30, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30426757/is-ultrasonography-sufficient-for-evaluation-of-mental-foramen
#13
Fatma Çağlayan, Muhammed Akif Sümbüllü, Hayati Murat Akgül
METHODS: The measurements were established on 60 MFs of 30 patients (16 males, 14 females) with a mean age of 30.70 ± 9,23 years. The vertical and the horizontal diameters, distance to the alveolar crest of the MF was measured by both CBCT and USG. Results obtained with CBCT and USG were statistically compared. And also the blood flow of the MF determined by Doppler USG. RESULTS: All of the MFs could be detected by CBCT and USG. The vertical and the horizontal diameter measurements were compatible with each other by CBCT and USG...
November 30, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30495970/application-of-fused-image-in-detecting-abnormalities-of-temporomandibular-joint
#14
Ruo-Han Ma, Gang Li, Yi Sun, Juan-Hong Meng, Yan-Ping Zhao, Hao Zhang
OBJECTIVES: To present a method for image fusion of cone-beam computed tomography (CBCT)/computed tomography (CT) and magnetic resonance imaging (MRI) and to explore whether the image data sets fused in such a way could aid the detection of temporomandibular joint (TMJ) anatomical structures and lesions. METHODS: There were five cases included in this study. One case was space occupying lesion giant cell tumor of tendon sheaths (GCTTS), one case was chronic inflammation in the condyle, one case was articular disc calcification of the bilateral TMJs, and the other two cases were temporomandibular joint disorders (anterior disc displacement without reduction)...
November 29, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30426762/assessment-of-image-quality-and-exposure-parameters-of-an-intraoral-portable-x-rays-device
#15
Elton Gonçalves Zenóbio, Madelon Af Zenóbio, Carolina Db Azevedo, Maria do Socorro Nogueira, Cláudio D Almeida, Flávio R Manzi
OBJECTIVE: To evaluate the exposure parameters, radiation protection, absorbed dose and radiographic image quality of the DIOX® intraoral portable radiography device. METHODS: The exposure parameters were measured using the Xi UNFORS detector. Operator exposure to secondary radiation was measured using the 1800cc ionization chamber coupled to the electrometer. The absorbed dose (D) in the patient was calculated using TLD-100H positioned in the Alderson RANDO anthropomorphic simulator...
November 14, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30379570/a-deep-learning-artificial-intelligence-system-for-assessment-of-root-morphology-of-the-mandibular-first-molar-on-panoramic-radiography
#16
Teruhiko Hiraiwa, Yoshiko Ariji, Motoki Fukuda, Yoshitaka Kise, Kazuhiko Nakata, Akitoshi Katsumata, Hiroshi Fujita, Eiichiro Ariji
OBJECTIVES: The distal root of the mandibular first molar occasionally has an extra root, which can directly affect the outcome of endodontic therapy. In this study, we examined the diagnostic performance of a deep learning system for classification of the root morphology of mandibular first molars on panoramic radiographs. Dental cone-beam CT (CBCT) was used as the gold standard. METHODS: CBCT images and panoramic radiographs of 760 mandibular first molars from 400 patients who had not undergone root canal treatments were analyzed...
November 9, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30407848/dimensional-accuracy-of-cone-beam-ct-with-varying-angulation-of-the-jaw-to-the-x-ray-beam
#17
George K Koch, Adam Hamilton, Kelly Wang, Laura Herschdorfer, Kyu Ha Lee, German O Gallucci, Bernard Friedland
OBJECTIVES: Cone beam CT (CBCT) machines do not always allow for patients to be scanned in the ideal position for image acquisition. This study aimed to investigate the influence of the position/angulation of the mandible relative to the X-ray beam of a CBCT machine. METHODS: Five sequential CBCT scans were captured of a human mandible at each angulation of 10°, 20°, 30°, and 40° using a coronal and sagittal positioning. Inspection software utilized a best-fit alignment to automatically calculate the three-dimensional variation at 15 standardized points of interest...
November 8, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30379560/an-ex-vivo-comparative-study-of-occlusal-and-proximal-caries-using-terahertz-and-x-ray-imaging
#18
Kıvanç Kamburoğlu, Burcu Karagöz, Hakan Altan, Doĝukan Özen
OBJECTIVES: To examine the effectiveness of terahertz (THz) pulsed imaging (TPI) in comparison to intraoral photostimulable phosphor late (PSP) and cone beam CT (CBCT) for the detection of dental caries ex vivo. METHODS: Newly extracted 32 human permanent teeth surfaces (16 with caries and 16 without caries) were serially sectioned mesiodistally and imaged by using four image sets as follows: (1) CBCT; (2) PSP; (3) THz movie video; and (4) THz static images. All images were evaluated twice separately by two calibrated observers for the presence/absence of caries using a 5-grade rating/confidence scale...
November 7, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30346803/imaging-the-bifid-mandibular-canal-using-high-resolution-mri
#19
Peerapong Wamasing, Chutamas Deepho, Hiroshi Watanabe, Yoshiki Hayashi, Junichiro Sakamoto, Tohru Kurabayashi
OBJECTIVE: This study aimed to investigate the incidence of bifid mandibular canals (BMCs) using high-resolution MRI with a three-dimensional volumetric interpolated breath-hold examination sequence (3D-VIBE) through the neurovascular bundle (NVB). METHODS: In this retrospective study, we extracted 154 datasets from our archive of patients who underwent MRI examination with a 3D-VIBE sequence for mandible lesions from January 2015 to April 2016. The right and the left mandibles were treated independently with 59 cases excluded due to NVB morphology or artifacts, yielding 249 hemi-mandible cases classified among three subtypes: Type 0 with no BMC, Type one with one NVB and two NVBs on route to it, and Type two with two NVBs...
November 7, 2018: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/30346802/prevalence-of-radiographic-findings-on-jaws-exposed-to-antiresorptive-therapy-a-meta-analysis
#20
Kamile Leonardi Dutra, Letícia Fernanda Haas, Glaucia S Zimmermann, Gilberto Melo, Mariana Comparotto Minamisako, Carlos Flores-Mir, Márcio Corrêa
OBJECTIVES: Determine the prevalence of radiographic findings (RF) on both jaws among patients receiving antiresorptive bone therapy. METHODS: Six electronic databases and partial grey literature were searched. Data was collected based on predetermined criteria. The key features from the included studies were extracted. The MAStARI tool assessed the potential risk of bias (RoB) among the studies, while the GRADE approach determined the level of evidence. RESULTS: 29 studies were identified and included in the qualitative analysis, totalling 1133 patients...
November 7, 2018: Dento Maxillo Facial Radiology
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