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Dento Maxillo Facial Radiology

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https://www.readbyqxmd.com/read/28402714/3d-dental-image-registration-using-exhaustive-deformable-models-a-comparative-study
#1
M-P Kalla, T L Economopoulos, G K Matsopoulos
OBJECTIVE: Image registration is commonly used in dental applications for aligning imaging data sets, which is particularly useful when assessing the progression or regression of particular pathomorphic conditions. However, due to the nature of the processed data or the data acquisition process itself, rigid body registration may be insufficient to accurately align the processed data sets. In such cases, deformable models are employed. This study presents a comparison of four well-established deformable models for aligning Cone-Beam Computed Tomography (CBCT) volumes...
April 12, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28306330/effect-of-changing-the-head-position-on-accuracy-of-transverse-measurements-of-the-maxillofacial-region-made-on-cone-beam-computed-tomography-and-conventional-posterior-anterior-cephalograms
#2
Abbas Shokri, Amirfarhang Miresmaeili, Nasrin Farhadian, Sepideh Falah-Kooshki, Payam Amini, Najmeh Mollaie
OBJECTIVES: This study aimed to assess the effect of head position on the accuracy of transverse measurements of the maxillofacial region on CBCT and conventional posteroanterior (PA) cephalograms. The second objective of this study was to find skull positions with the greatest and smallest effect on transverse measurements in the maxillofacial region. METHODS: PA cephalograms and CBCT scans were obtained from 10 dry human skulls in 7 positions, namely the central position, 10° and 20° rotations, 10° and 20° tilts and 10° and 20° tips...
April 12, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28266870/evaluation-of-different-low-dose-multidetector-ct-and-cone-beam-ct-protocols-in-maxillary-sinus-imaging-part-i-an-in-vitro-study
#3
Abeer A Almashraqi, Eman A Ahmed, Nashwa S Mohamed, Imad H Barngkgei, Nader A Elsherbini, Esam S Halboub
OBJECTIVES: This in vitro study aimed to assess radiation dose and image quality of different low-dose multidetector CT (MDCT) and CBCT imaging protocols in comparison with the standard MDCT protocol for maxillary sinus imaging. METHODS: Effective dose (E) and image quality of 10 MDCT (changing effective milliampere second starting from 141.3 EmAs to 20 EmAs) and 3 CBCT protocols (changing milliampere second and voxel size) were assessed throughout scanning an anthropomorphic head and neck Alderson Rando phantom...
April 12, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28384073/the-estimation-of-skeletal-maturity-of-patients-with-cleft-lip-and-palate-using-statistical-shape-analysis-a-preliminary-study
#4
Sung-Hun Kim, Youn-Kyung Choi, Sang Min Shin, Yong-Seok Choi, Tetsutaro Yamaguchi, Masahiro Takahashi, Koutaro Maki, Soo-Byung Park, Yong-Il Kim
OBJECTIVE: To propose a skeletal maturity assessment method by developing a statistical regression analysis model through the integration of lateral and axial images of cervical vertebrae of cleft lip and palate (CLP) patients obtained through cone beam computed tomography (CBCT). METHODS: Forty-nine patients with CLP (28 females, 21 males; age range, 4-16 years) who had CBCT and hand-wrist radiographic data were selected. With the landmarks' coordinates from lateral and axial images of cervical vertebrae, Procrustes analysis and principal components analysis yielded principal component (PC) scores of each cervical vertebra, with the centroid size as the size factor...
April 6, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28375696/development-and-validation-of-a-questionnaire-to-evaluate-infection-control-in-oral-radiology-methodological-issues-to-avoid-misinterpretation
#5
Saeid Safiri, Erfan Ayubi
No abstract text is available yet for this article.
April 4, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28362170/accuracy-and-reproducibility-of-dental-measurements-on-tomographic-digital-models-a-systematic-review-and-meta-analysis
#6
Jamille Barros Ferreira, Ilana Oliveira Christovam, David Silveira Alencar, Andréa Fonseca Jardim da Motta, Claudia Trindade Mattos, Adriana de Alcantara Cury-Saramago
OBJECTIVES: The aim of this systematic review with meta-analysis was to assess the accuracy and reproducibility of dental measurements obtained from digital study models generated from cone beam computed tomography (CBCT) compared with those acquired from plaster models. METHODS: Electronic databases Cochrane Library, Medline (via PubMed), Scopus, VHL, Web of Science, and System for Information on Grey Literature in Europe (SIGLE) were screened to identify papers from 1998 until February 2016...
March 31, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28350523/comparison-of-micro-ct-and-cone-beam-ct-on-the-feasibility-of-assessing-mandibular-trabecular-structures-in-mandibular-condyle
#7
Xin Liang, Zuyan Zhang, Jianping Gu, Zhihui Wang, Bart Vandenberghe, Reinhilde Jacobs, Jie Yang, Guowu Ma, Haibin Ling, Xuchen Ma
OBJECTIVES: To evaluate the accuracy of Cone-beam CT (CBCT) in assessing trabecular structures Methods: Two human mandibles were scanned by micro-CT (Skyscan 1173 high energy spiral scan micro-CT, Skyscan NV, Kontich, Belgium) and CBCT(3D Accuitomo 170, Morita Japan). The CBCT images were reconstructed in 0.5mm and 1 mm thickness. The condylar images were selected for registration. A parallel algorithm for histogram computation was introduced to perform the registration. Mutual information (MI) value was used to evaluate the match between the images obtained from micro-CT and CBCT...
March 28, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28211288/imaging-evaluating-of-the-implant-bone-interface-an-in-vitro-radiographic-study
#8
Michele M Vidor, Gabriela S Liedke, Mariana B Vizzotto, Heraldo L D da Silveira, Priscila F da Silveira, Cristiano W Araujo, Heloisa E D da Silveira
OBJECTIVES: To analyze the diagnostic accuracy of conventional and digital radiographic images and the impact of digital filters in evaluating the bone-implant interface. METHODS: Titanium implants were inserted into 74 fresh bovine ribs blocks, 37 fitting tight to the bone walls (simulating the existence of osseointegration) and 37 with a gap of 0.125 mm (simulating a failure in the osseointegration process). Periapical radiographs were taken with conventional film and two phosphor plate systems [VistaScan(®) (Dürr Dental, Bietigheim-Bissingen, Germany) and Express(®) (Instrumentarium, Tuusula, Finland)]...
March 28, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28186844/prevalence-of-calcified-carotid-artery-atheromas-on-panoramic-images-of-older-men-with-gout-a-descriptive-retrospective-study
#9
Arthur H Friedlander, Lindsay L Graves, Shannon G Grabich, Nona Aghazadehsanai, Tina I Chang
OBJECTIVES: Given the enhanced risk of ischaemic stroke resulting from the direct effects of hyperuricaemia on vascular plaque formation seen among older males with gout, we sought to determine the prevalence of calcified carotid artery atheromas (CCAAs) on their panoramic images (PIs). METHODS: Medical record librarians identified all male patients over 45 years, who had a diagnosis of gout and a PI incidentally obtained between 2000 and 2015. The prevalence rate of CCAA on technically appropriate images was determined, as were these patients' atherogenic risk profiles including: age, body mass index, hypertension and dyslipidaemia...
March 28, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28186836/assessment-of-osteoporotic-alterations-in-type-2-diabetes-a-retrospective-study
#10
Luciana Munhoz, Arthur R G Cortes, Emiko S Arita
OBJECTIVES: To analyze the influence of Type 2 diabetes on bone mineral density (BMD) and panoramic radiomorphometry in postmenopausal females, comparing with results from non-diabetic postmenopausal females. METHODS: A total of 228 postmenopausal females (mean age: 59.51 ± 11.08 years) were included in this study. Demographics, T scores and Z scores from peripheral dual X-ray absorptiometry (DXA) and mandibular cortical index (MCI) from panoramic radiographs were assessed...
March 28, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28332866/comparing-cone-beam-computed-tomography-with-periapical-radiography-for-assessing-root-canal-obturation-in-vivo-using-microsurgical-findings-as-validation
#11
Dongzhe Song, Lan Zhang, Wei Zhou, Qinghua Zheng, Xingyu Duan, Xuedong Zhou, Dingming Huang
OBJECTIVES: The aim of this study was to verify whether there is a difference in the in vivo performance characteristics of CBCT and periapical radiography (PR) in assessing the apical extension of root canal obturation (RCO) and to evaluate the ability of CBCT in void detection using microsurgical findings as validation. METHODS: This study included 323 tooth roots that required surgical treatment and for which pre-existing periapical radiographs and CBCT images were available...
March 23, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28332854/the-intravoxel-incoherent-motion-mri-of-lateral-pterygoid-muscle-a-quantitative-analysis-in-patients-with-temporomandibular-joint-disorders
#12
Supak Ngamsom, Shin Nakamura, Junichiro Sakamoto, Shinya Kotaki, Akemi Tetsumura, Tohru Kurabayashi
OBJECTIVES: To quantitatively evaluate diffusion and perfusion status of lateral pterygoid muscle (LPM) in patients with temporomandibular joint disorder (TMD) by intravoxel incoherent motion (IVIM) imaging and to correlate with findings on temporomandibular joints (TMJs) by conventional MRI. METHODS: 42 patients with TMD underwent MRI. To assess IVIM parameters, diffusion-weighted imaging was obtained by spin-echo-based single-shot echoplanar imaging. Regions of interest were created on all diffusion-weighted images of the superior belly of the lateral pterygoid (SLP) and inferior belly of the lateral pterygoid (ILP) at b-values 0-500 s mm(-2)...
March 23, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28306334/impact-of-prone-supine-and-oblique-patient-positioning-on-cbct-image-quality-contrast-to-noise-ratio-and-figure-of-merit-value-in-the-maxillofacial-region
#13
Juha Koivisto, Maureen van Eijnatten, Jorma Järnstedt, Kirsi Holli-Helenius, Prasun Dastidar, Jan Wolff
OBJECTIVES: To assess the impact of supine, prone and oblique patient imaging positions on the image quality, contrast-to-noise ratio and figure of merit value in the maxillofacial region using a cone beam computed tomography scanner. Furthermore, the CBCT supine images were compared to supine MSCT images. METHODS: One fresh frozen cadaver head was scanned in prone, supine and oblique imaging positions using a mobile CBCT scanner. MSCT images of the head were acquired in a supine position...
March 17, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28299943/the-value-of-combining-conventional-diffusion-weighted-and-dynamic-contrast-enhanced-mr-imaging-for-the-diagnosis-of-parotid-gland-tumors
#14
Xiaofeng Tao, Gongxin Yang, Pingzhong Wang, Yingwei Wu, Wenjing Zhu, Huimin Shi, Xin Gong, Weiqing Gao, Qiang Yu
OBJECTIVE: The aim of this study was to determine the value of combining conventional MRI, diffusion-weighted (DWI) and dynamic contrast enhanced MRI (DCE-MRI) in diagnosing solid neoplasms in the parotid gland. METHODS: A total of 148 subjects (101 with benign and 47 with malignant tumors) were evaluated with conventional MRI, DWI and DCE-MRI prior to surgery and pathologic verification. The items observed with conventional MRI included the shape, capsule and signal intensity of parotid masses...
March 16, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28186845/image-findings-of-bisphosphonate-related-osteonecrosis-of-jaws-comparing-with-osteoradionecrosis
#15
Kenichi Obinata, Shinichi Shirai, Hitoshi Ito, Motoyasu Nakamura, Marco Carrozzo, Iain Macleod, Andrew Carr, Yutaka Yamazaki, Kanchu Tei
OBJECTIVES: The aim of this study was to evaluate image characteristics of bisphosphonate-related osteonecrosis of the jaws (BRONJ) and compare these with osteoradionecrosis (ORN). METHODS: 34 patients with BRONJ and 16 patients with ORN were included in this study. We investigated the CT and dental panoramic radiograph (DPR) images for osteolysis, osteosclerosis, sequestration, periosteal reaction, pathological fracture and spread of soft tissue inflammation around the jaws...
March 16, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28128638/evaluation-of-the-diagnostic-efficacy-of-two-cone-beam-computed-tomography-protocols-in-reliably-detecting-the-location-of-the-inferior-alveolar-nerve-canal
#16
Aditya Tadinada, Sydney Schneider, Sumit Yadav
OBJECTIVES: Reliable three-dimensional localization of the inferior alveolar nerve canal (IANC) is valuable for a variety of dentoalveolar procedures. Although conventional CBCT offers three-dimensional information at a reasonably low dose, it is still a significant amount of radiation. In this ex vivo study, we evaluated the ability of a 180° rotational CBCT acquisition protocol with lower number of basis projections to create a CBCT data set for reliable localization of the IANC compared with a conventional 360° rotational CBCT acquisition...
March 13, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28267931/ct-sinus-and-facial-bones-reporting-by-radiographers-findings-of-an-accredited-postgraduate-programme
#17
Paul Lockwood
OBJECTIVES: The aim of this study was to compare the observer performance of a cohort of radiographer's in reporting Computed Tomography (CT) sinus and facial bones investigations against a reference standard and alternative comparator of summary data from peer reviewed literature. METHODS: The participants (n=6) completed a 9-month part-time distance learning training programme prior to reporting an examination bank (n=25 cases) from a retrospectively collected and anonymised DICOM archive of CT examinations with referral histories and clinical reports...
March 7, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28267928/accuracy-of-linear-measurements-around-dental-implants-by-means-of-cone-beam-computed-tomography-with-different-exposure-parameters
#18
Lauren Oliveira Lima Bohner, Pedro Tortamano, Juliana Marotti
OBJECTIVES: The aim of this study was to determine the accuracy of linear measurements around dental implants when using CBCT unit devices presenting different exposure parameters. METHODS: Dental implants (n=18) were installed in the maxilla of human dry skulls and images were obtained using two CBCT devices; G1-Care Stream 9300 (70kVp, 6.3mA, voxel size 0.18mm, field of view 8x8 cm) and G2-R100 Veraview (75kVp, 7.0mA, voxel size 0.125mm, field of view 8x8cm). Measurements of bone thickness were performed in three points, located in the most apical portion of implant (A); 5 mm above the apical point (B) and implant platform (C)...
March 7, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28267927/comparison-of-clinical-values-between-cone-beam-computed-tomography-and-conventional-intraoral-radiography-in-periodontal-and-infrabony-defect-assessment
#19
Supreda Suphanantachat, Keenna Tantikul, Suphot Tamsailom, Pasupen Kosalagood, Kanokwan Nisapakultorn, Kanoknadda Tavedhikul
OBJECTIVE: The use of cone-beam computed tomography (CBCT) for periodontal diagnosis and treatment plan is limited. The aim of this study is to compare the assessment of periodontal conditions and infrabony defects between conventional intraoral radiography (IOR) and CBCT. METHODS: The study included 25 subjects who had periodontitis and at least 2 infrabony defects. All subjects received clinical periodontal examination, IOR, and CBCT. Three periodontists assigned periodontal diagnosis and prognosis of each tooth...
March 7, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28125294/effects-of-exposure-parameters-and-slice-thickness-on-detecting-clear-and-unclear-mandibular-canals-using-cone-beam-ct
#20
Gainer R Jasa, Mayumi Shimizu, Kazutoshi Okamura, Kenji Tokumori, Yohei Takeshita, Warangkana Weerawanich, Kazunori Yoshiura
OBJECTIVES: The purpose of this study was to clarify the effects of exposure parameters and image-processing methods when using CBCT to detect clear and unclear mandibular canals (MCs). METHODS: 24 dry half mandibles were divided into 2 groups with clear and unclear MCs based on a previous CBCT study. Mandibles were scanned using a CBCT system with varying exposure parameters (tube voltages 60 kV, 70 kV and 90 kV; and tube currents 2 mA, 5 mA, 10 mA and 15 mA) to obtain a total of 144 scans...
February 17, 2017: Dento Maxillo Facial Radiology
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