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Dento Maxillo Facial Radiology

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https://www.readbyqxmd.com/read/28937286/comparing-subjective-and-objective-image-quality-at-two-different-radiation-exposure-ranges-of-the-paranasal-sinus-ct-examinations-using-a-volumetric-320-row-detector-ct-system
#1
Berhan Pirimoglu, Recep Sade, Muhammed Sedat Sakat, Hayri Ogul, Suat Eren, Mecit Kantarci
OBJECTIVES: To evaluate image quality of protocol including 135 kVp, 5 mAs and 80 kVp, 5 mAs in the paranasal sinus CT examinations using single volumetric 320-row multidetector CT technique. METHODS: From September to December 2016, both of our control group including 135 kVp and 5 mAs and our study group including 80 kVp and 5 mAs paranasal CT protocols were simultaneously performed on 40 patients using single volumetric 320-row multidetector CT device. Image quality for bony structures, air-filled structures and soft tissues were independently assessed for each group by three blinded observers using a 3-point grading scale (0 = not diagnostic, 1 = partially diagnostic, 2 = diagnostic)...
September 21, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28937285/assessment-of-automatic-segmentation%C3%A2-of-teeth-using%C3%A2-a-watershed-based-method
#2
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/28937322/diffusion-tensor-imaging-reveals-morphological-alterations-of-the-lateral-pterygoid-muscle-in-patients-with-mandibular-asymmetry
#3
Enrico Nastro, Lilla Bonanno, Luciano Catalfamo, Michele Runci, Alessia Bramanti, Giuseppe Anastasi, Silvia Marino, Francesco Saverio De Ponte
OBJECTIVES: To evaluate non-invasively the morphological features of both lateral pterygoid (LPM) and masseter muscles by using Diffusion Tensor Imaging on two patients affected by mandibular asymmetry. METHODS: Two female patients with mandibular excess and asymmetry who underwent Le Fort I osteotomy and bilateral sagittal split osteotomy were recruited for this study. Morphological (T1-weighted) and diffusion weighted images were acquired with a 3T scanner one week before (T0) and one month after the surgery (T1)...
September 20, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28937280/lingual-tonsillolith-prevalence-and-imaging-characteristics-evaluated-on-2244-pairs-of-panoramic-radiographs-and-ct-images
#4
Akira Takahashi, Chieko Sugawara, Keiko Kudoh, Yoshiko Yamamura, Go Ohe, Tetsuya Tamatani, Youji Miyamoto
OBJECTIVES: Lingual tonsilloliths are not as well-known to radiologists than palatine tonsilloliths, although they might be common in clinical practice. The aim of this investigation was to clarify the prevalence and imaging characteristics of lingual tonsilloliths using panoramic radiographs and computed tomography (CT) images. SUBJECTS AND METHODS: This study included 2244 patients without pathology at the base of tongue who underwent panoramic radiography and CT of the maxillofacial region...
September 20, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28891710/the-use-of-a-thyroid-shield-for-intra-oral-anterior-oblique-occlusal-views-a-risk-based-approach
#5
Mark Worrall, Alison Menhinick, Donald J Thomson
OBJECTIVES: To estimate the radiation dose reduction to the thyroid for an anterior oblique occlusal view from the use of a thyroid shield, compare this to the variation in thyroid dose resulting from differences in examination positioning and discuss the additional considerations associated with the use of a thyroid shield before making a recommendation on their routine use for this examination. METHODS: Doses to the oral mucosa, the salivary glands, the thyroid, the extra-thoracic airways, the oesophagus and the lungs were directly measured for anterior oblique occlusal x-rays of a Rando phantom with and without a thyroid shield using strips of calibrated XRQA Gafchromic film...
September 11, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28872352/patient-movement-characteristics-and-the-impact-on-cbct-image-quality-and-interpretability
#6
Rubens Spin-Neto, Cláudio Costa, Daniela Mra Salgado, Nataly Rm Zambrana, Erik Gotfredsen, Ann Wenzel
OBJECTIVES: To assess the impact of patient movement characteristics and metal/radiopaque materials in the field-of-view (FOV) on CBCT image quality and interpretability. METHODS: 162 CBCT examinations were performed in 134 consecutive (i.e. prospective data collection) patients (age average: 27.2 years; range: 9-73). An accelerometer-gyroscope system registered patient's head position during examination. The threshold for movement definition was set at ≥0...
September 5, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28871830/comparison-of-panoramic-radiography-and-cone-beam-ct-in-the-assessment-of-juxta-apical-radiolucency
#7
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/28871814/osseous-changes-in-patients-with-medicationrelatedosteonecrosis-of-the-jaws
#8
Zeynep Burcin Gönen, Canay Yillmaz Asan, Gökmen Zararsiz, Erdem Kiliç, Alper Alkan
OBJECTIVES: Medication-Related Osteonecrosis of the Jaw (MRONJ) is a severe side effect of antiresorptive agents. The aim of this study was to investigate the osseous changes in patients with MRONJ. METHODS: Cone Beam Computed Tomography (CBCT) images of 25 patients with MRONJ and controls were retrospectively evaluated. Buccal, lingual, apical cortical bone thicknesses; buccal, lingual, apical intracortical and cancellous bone density; diameter of mental foramen and incisive canal, and width of mental foramen were measured...
September 5, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28869397/precision-of-cone-beam-computed-tomography-to-assess-periodontal-bone-defects-a-systematic-review-and-meta-analysis
#9
Letícia Fernanda Haas, Glaucia Santos Zimmermann, Graziela de Luca Canto, Carlos Flores-Mir, Márcio Corrêa
OBJECTIVES: Evaluate the precision of cone beam computed tomography in measuring periodontal bone defects when compared to the reference standard (in situ measurement). METHODS: Studies in which the main objective was to evaluate the precision of cone beam computed tomography in measuring periodontal bone defects when compared to the reference standard were selected. Four databases were searched. The studies were selected by two independently reviewers. The methodology of selected studies was assessed using the 14-item Quality Assessment Tool for Diagnostic Accuracy Studies...
September 4, 2017: Dento Maxillo Facial Radiology
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
#10
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
https://www.readbyqxmd.com/read/28845691/four-dimensional-ct-angiography-4d-cta-in-the-evaluation-of-juvenile-nasopharyngeal-angiofibromas-comparison-with-digital-subtraction-angiography-dsa-and-surgical-findings
#11
Zebin Xiao, Yingyan Zheng, Jian Li, Dehua Chen, Fang Liu, Dairong Cao
OBJECTIVES: To explore the value of four-dimensional CT angiography (4D-CTA) in the preoperative evaluation of JNAs using 320-row volume CT. METHODS: 4D-CTA and DSA data of 18 patients with histopathologically proven JNAs were retrospectively reviewed. The location, extent, feeding vessels and stage of JNAs were assessed by two radiologists independently and blindly. The agreements between both reviewers and between 4D-CTA and surgical findings for assessing the above indicators were analyzed respectively...
August 27, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28845679/micro-ct-and-nano-ct-analysis-of-filling-quality-of-three-different-endodontic-sealers
#12
Yan Huang, Berkan Celikten, Karla de Faria Vasconcelos, Laura Ferreira Pinheiro Nicolielo, Nicholas Lippiatt, Arda Buyuksungur, Reinhilde Jacobs, Kaan Orhan
OBJECTIVES: To investigate voids in different root canal sealers using micro-CT and nano-CT, and to explore the feasibility of using nano-CT for quantitative analysis of sealer filling quality. METHODS: Thirty extracted mandibular central incisors were randomly assigned into three groups according to the applied root canal sealers (Total BC Sealer, Sure Seal Root, AH Plus) by the single cone technique. Subsequently, micro-CT and nano-CT were performed to analyze the incidence rate of voids, void fraction, void volume and their distribution in each sample...
August 27, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28749736/cluster-signal-to-noise-analysis-for-evaluation-of-the-information-content-in-an-image
#13
Warangkana Weerawanich, Mayumi Shimizu, Yohei Takeshita, Kazutoshi Okamura, Shoko Yoshida, Kazunori Yoshiura
OBJECTIVES: To develop an observer-free method of analyzing image quality related to the observer performance in the detection task and 2) to analyze observer behavior patterns in the detection of small mass changes in CBCT images. METHODS: Thirteen observers detected holes in a Teflon phantom in CBCT images. Using the same images, we developed a new method, cluster signal-to-noise analysis, to detect the holes by applying various cut-off values using ImageJ and reconstructing cluster signal-to-noise curves...
July 27, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28749703/a-new-simple-three-dimensional-method-to-characterize-upper-airway-in-orthognathic-surgery-patient
#14
Gabriele Di Carlo, Sirwan Gurani Fernandez, Else Marie Pinholt, Paolo Cattaneo
OBJECTIVES: To develop and validate a new reproducible 3D upper airway analysis based on skeletal structures not involved in the modification, which occur during orthognathic surgery. METHODS: From retrospective cohort of orthognathic surgically treated patients, pre- and postsurgical CBCTscans of 10 post-pubertal patients were randomly selected. Two operators identified the landmarks, calculated the airway volumes, cross sections and linear measurements on the ten scans twice at two different time intervals...
July 27, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28749701/fish-scale-artifact-on-an-intraoral-imaging-receptor
#15
Allison Buchanan, Carla Morales, Stephen Looney, Sajitha Kalathingal
OBJECTIVES: To describe an artifact, termed the fish scale artifact, present on an intraoral imaging receptor. METHODS: Thirty brand new DIGORA Optime PSP plates (Soredex/Orion Corp., Helsinki, Finland) were imaged using the Dental Digital Quality Assurance (DDQA) radiographic phantom (Dental Imaging Consultants LLC, San Antonio, TX, USA). All PSP plates were scanned at the same spatial resolution (dpi) using the high resolution mode. Two evaluators assessed all 30 plates...
July 27, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28749700/radiographic-diagnosis-of-root-fractures-a-systematic-review-meta-analyses-and-sources-of-heterogeneity
#16
Fernanda Cristina Sales Salineiro, Solange Kobayashi-Velasco, Mariana Minatel Braga, Marcelo Gusmão Paraiso Cavalcanti
OBJECTIVE: Many studies to evaluate the accuracy of root fracture diagnosis have been conducted. However, there is a scarcity of studies to assess the quality and the sources of heterogeneity in the literature. For this reason, the aim of this study was to conduct systematic reviews and meta-analyses to summarize the available evidence on detection of root fractures by CBCT and PR images and the interference of artifact by investigating possible sources of heterogeneity. METHODS: Studies reporting root fracture detection, from January 2010 to February 2016, were selected...
July 27, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28749697/tld-measurements-and-monte-carlo-calculations-of-head-and-neck-organ-and-effective-doses-for-cone-beam-computed-tomography-using-3d-accuitomo-170
#17
Marina Ernst, Peter Manser, Karl Dula, Werner Volken, Marco Stampanoni, Michael Fix
OBJECTIVES: In dentistry the use of Cone Beam Computed Tomography (CBCT) has steadily increased over the last few years. The aim of this study was to measure organ doses and to perform dose calculations based on Monte Carlo (MC) simulations to work out a basis for full 3D dose calculations for any patient examination performed with the machine used in this study. METHODS: TLD-100 LiF detectors were placed at 71 measurement positions on the surface and within a RT-Humanoid phantom to cover all relevant radiosensitive organs and tissues...
July 27, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28707954/lymphoepithelial-carcinoma-of-salivary-glands-ct-and-mr-imaging-findings
#18
Pingzhong Wang, Jie Yang, Qiang Yu
OBJECTIVES: To depict the CT and MR imaging characteristics of salivary gland lymphoepithelial carcinoma (LEC) and provide more diagnostic information for this malignancy. METHODS: One hundred and three salivary gland LEC subjects were retrospectively reviewed. The subjects include 35 males with a mean age of 40.8 years and 68 females with a mean age of 49.4 years. Of 103 subjects, 86 subjects were in the parotid gland, five in the submandibular gland, one in the sublingual gland, three in the cheek, and eight in the palate...
July 14, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28707526/diagnostic-validity-of-periapical-radiography-and-cbct-for-assessing-periapical-lesions-that-persist-after-endodontic-surgery
#19
Casper Kruse, Rubens Spin-Neto, Jesper Reibel, Ann Wenzel, Lise-Lotte Kirkevang
OBJECTIVES: Traditionally, healing after surgical endodontic retreatment (SER); i.e. apicectomy with or without a retrograde filling, is assessed in periapical radiographs (PR). Recently, the use of Cone Beam CT (CBCT) has increased within endodontics. Generally, CBCT detects more periapical lesions than PR, but basic research on the true nature of these lesions is missing. The objective was to assess the diagnostic validity of PR and CBCT for determining inflammation in SER-cases that were re-operated (SER-R) due to unsuccessful healing, using histology of the periapical lesion as reference for inflammation...
July 14, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28707525/is-there-a-role-for-ultrasound-guided-sialoplasty-in-the-management-of-salivary-duct-strictures
#20
Jimmy Makdissi, Lee Feinberg, Amit Roy
Ductal stricture is a common cause of obstructive salivary gland disease. Balloon dilatation of the parotid duct as a minimally invasive technique is currently carried out under fluoroscopic guidance or during sialendocopy. We present a case report of ultrasound guided balloon dilatation. A 45 year old lady presented with a long history of obstructive symptoms affecting the right parotid gland. Ultrasound examination revealed a tortuous right main parotid duct with marked dilatation throughout its course and multiple sites of focal stricture formation...
July 14, 2017: Dento Maxillo Facial Radiology
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