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Dento Maxillo Facial Radiology

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https://www.readbyqxmd.com/read/27910719/artifacts-in-multimodal-imaging-of-titanium-zirconium-and-binary-titanium-zirconium-alloy-dental-implants-an-in-vitro-study
#1
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
#2
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
#3
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
#4
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/27845594/diffusion-weighted-mri-for-differentiation-between-sialadenitis-and-pleomorphic-adenoma
#5
Guilherme T C Terra, Jefferson X D Oliveira, Adalsa Hernandez, Silvia V Lourenço, Emiko S Arita, Arthur R G Cortes
OBJECTIVES: The aim of this study was to compare apparent diffusion coefficient (ADC) values from diffusion-weighted MRI (DWI) among normal salivary glands, cases with sialadenitis and cases with pleomorphic adenoma of major salivary glands. METHODS: 22 patients (totalling 44 major salivary glands) diagnosed with either unilateral sialadenitis (on either parotid or submandibular gland) or parotid gland pleomorphic adenoma were selected. Contralateral non-affected glands (normal) were also analyzed...
November 15, 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
#6
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
#7
(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/27796145/validity-of-the-assessment-method-of-skeletal-maturation-by-cervical-vertebrae-a-systematic-review-and-meta-analysis
#8
Luciana Butini Oliveira, Cecilia Pedroso Turssi, José Luiz Cintra Junqueira
No abstract text is available yet for this article.
October 31, 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
#9
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
#10
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
#11
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
https://www.readbyqxmd.com/read/27786546/ct-of-facial-fracture-fixation-an-experimental-study-of-artifact-reducing-methods
#12
Elina M Peltola, Teemu Mäkelä, Ville Haapamäki, Anni Suomalainen, Junnu Leikola, Seppo K Koskinen, Mika Kortesniemi, Mika P Koivikko
OBJECTIVES: This study aimed to determine the optimal postoperative CT imaging method that enables best visualization of facial bony structures in the vicinity of osteosynthesis material. METHODS: Conducted at (blinded 1), this study relied on scanning a phantom with cone-beam computed tomography (CBCT), a 64-slice computed tomography (CT) and a high-definition multi-slice CT with dual-energy scan (providing monochromatic images of 70, 100, 120 and 140 keV energy levels) and iterative reconstruction (IR) methods...
October 27, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27759998/presurgical-evaluation-of-bony-implant-sites-using-panoramic-radiography-and-cone-beam-computed-tomography-influence-of-medical-education
#13
Michael Dau, Amir Edalatpour, Ralf Schulze, Bilal Al-Nawas, Abdulmonem Alshihri, Peer W Kämmerer
OBJECTIVES: The aim of this study was to compare the subjective quality rating of panoramic radiography (PAN) and cone beam computed tomography (CBCT) in planning of dental implant procedures by clinicians with different educational background. METHODS: Radiographic images (PAN and CBCT) of 42 patients were examined as follows: 10 maxillary (MX) anterior region, 16 MX posterior region and 16 mandibular (MD) posterior region. These sites were used for planning of dental implant insertion...
October 19, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27635789/nasal-endoscopy-an-adjunct-to-patient-selection-for-preoperative-low-dose-ct-examination-in-chronic-rhinosinusitis
#14
Marcin Fraczek, Maciej Guzinski, Monika Morawska-Kochman, Kamil H Nelke, Tomasz Krecicki
OBJECTIVES: The growing awareness of increased X-ray exposure to the public has led to the propagation of several methods for reducing the radiation dose during CT examination. Low-dose CT protocols do not, however, have an established role in pre-operative evaluation. The aim of this article was to assess the usefulness of nasal endoscopy in the selection of patients under pre-operative care for low-dose CT examination. METHODS: A cadaver head was used to discover institutional minimum acceptable CT image quality and scanning settings...
October 17, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27730824/a-comparable-study-of-the-diagnostic-performance-of-orbital-ultrasonography-and-cbct-in-patients-with-suspected-orbital-floor-fractures-some-considerations
#15
Heraldo L D da Silveira, Mathias P Fontana, Heloísa E D da Silveira
No abstract text is available yet for this article.
October 12, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27730822/response-letter-to-letter-to-the-editor
#16
Daniel Fouladi, Hediyeh Mahmoudian, Masoumeh Johari
No abstract text is available yet for this article.
October 12, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27635667/metastases-to-the-parotid-nodes-ct-and-mr-imaging-findings
#17
Nobuo Kashiwagi, Takamichi Murakami, Masafumi Toguchi, Katsuyuki Nakanishi, Shojiro Hidaka, Hideyuki Fukui, Masatomo Kimura, Mutsukazu Kitano, Noriyuki Tomiyama
OBJECTIVES: To present and characterize CT and MR imaging findings of metastases to the parotid nodes. METHODS: CT (n = 10) and MR (n = 11) images from 14 patients with metastases to the parotid nodes were reviewed. The primary tumour sites were the ocular adnexa in five patients, facial skin in four patients, upper aerodigestive tract in four patients and thyroid gland in one patient. CT and MR images were evaluated with emphasis on the size and number of parotid tumours, their location in the parotid gland, the presence of associated clinically pathological cervical nodes or previous history of cervical node metastasis, margin characteristics and the presence of central necrosis...
October 11, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27704872/mr-imaging-of-the-temporomandibular-joint-comparison-between-acquisitions-at-7-0-tesla-using-dielectric-pads-and-3-0-tesla
#18
Felix P Kuhn, Georg Spinner, Filippo Del Grande, Michael Wyss, Marco Piccirelli, Stefan Erni, Pascal Pfister, Michael Ho, Bert-Ram Sah, Lukas Filli, Dominik A Ettlin, Luigi M Gallo, Gustav Andreisek, Andrei Manoliu
OBJECTIVES: To qualitatively and quantitatively compare MR imaging of the temporomandibular joint (TMJ) at 7.0 T using high-permittivity dielectric pads and 3.0 T using a clinical high-resolution protocol. METHODS: IRB approved study with written informed consent. 12 asymptomatic volunteers were imaged at 7.0T and 3.0T using 32-channel head coils. High-permittivity dielectric pads consisting of barium titanate in deuterated suspension were used for imaging at 7...
October 5, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27604390/study-of-the-frequency-and-location-of-incidental-findings-of-the-maxillofacial-region-in-different-fields-of-view-in-cbct-scans
#19
Ivna A Lopes, Rosana M A Tucunduva, Roberta H Handem, Ana Lucia A Capelozza
OBJECTIVES: The aim of this study was to identify the type and frequency of incidental findings (IFs) in the maxillofacial region of CBCT scans with different sizes of field of view (FOV), and the clinical relevance of the findings was classified as requirement or not of monitoring, treatment or referral to a specialist. METHODS: We analyzed 150 CBCT examinations, divided according to the size of the FOV into 3 groups: 6-cm maxilla, 6-cm mandible and 13-cm maxilla/mandible...
October 5, 2016: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27681861/radiographic-signs-of-pathology-determining-removal-of-an-impacted-mandibular-third-molar-assessed-in-a-panoramic-image-or-cbct
#20
Louise Hauge Matzen, Lars Schropp, Rubens Spin-Neto, Ann Wenzel
OBJECTIVES: To 1)compare pathological findings related to the mandibular third molar in panoramic images (PAN) and CBCT; 2)estimate the frequency of removals if pathological findings were indicative; and 3)assess factors in PAN associated with resorption and marginal bone loss at the second molar as observed in CBCT. METHODS: 379 mandibular third molars were examined with PAN and CBCT. Four observers registered resorption and marginal bone loss at the second molar and increased periodontal space at the third molar in both imaging modalities...
September 28, 2016: Dento Maxillo Facial Radiology
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