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Dento Maxillo Facial Radiology

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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
#1
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
#2
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
#3
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/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
#4
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 cone beam computed tomography (CBCT) and conventional posterior-anterior (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 seven positions namely the central position, 10° and 20° rotations, 10° and 20° tilts and 10° and 20° tips...
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
#5
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/28128638/evaluation-of-the-diagnostic-efficacy-of-two-cone-beam-computed-tomography-protocols-in-reliably-detecting-the-location-of-the-inferior-alveolar-nerve-canal
#6
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
#7
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
#8
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
#9
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/28266870/evaluation-of-different-low-dose-multidetector-ct-and-cone-beam-ct-protocols-in-maxillary-sinus-imaging-part-i-an-in-vitro-study
#10
Abeer A Almashraqi, Eman A Ahmed, Nashwa S Mohamed, Imad H Barngkgei, Nader A Elsherbini, Esam S Halboub
OBJECTIVES: This in-vitro study aimed at assessing radiation dose and image quality of different low-dose MDCT and CBCT imaging protocols in comparison to standard MDCT protocol for maxillary sinus imaging. METHODS: Effective dose (E) and image quality of 10 MDCT (changing effective milliampere (EmAs) starting from 141.3 to 20) and 3 CBCT protocols (changing mAs and voxel size (VS)) were assessed throughout scanning an anthropomorphic head and neck Alderson Rando phantom...
March 7, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28211288/imaging-evaluating-of-the-implant-bone-interface-an-in-vitro-radiographic-study
#11
M M Vidor, G S Liedke, M B Vizzotto, Hld da Silveira, P F da Silveira, C W Araujo, Hed 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 (Vista Scan and Express)...
February 17, 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
#12
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
https://www.readbyqxmd.com/read/28107028/interrelationship-of-clinical-radiographic-and-haematological-features-in-patients-under-bisphosphonate-therapy
#13
Valesca S Koth, Maria A Figueiredo, Fernanda G Salum, Karen Cherubini
OBJECTIVES: To analyze the clinical, radiographic and haematological aspects of patients under bisphosphonate therapy. METHODS: A retrospective study was conducted where the records of patients taking bisphosphonates were analyzed considering the occurrence of bisphosphonate-related osteonecrosis of the jaw (BRONJ). Evaluation included panoramic and periapical radiographies, haematological examinations and clinical features. Radiographies were analyzed determining the presence or absence of bone sclerosis, osteolysis, persisting alveolar socket, narrowing of the mandibular canal, widening of the periodontal ligament space, periradicular radiolucency, sequestrum and thickening of the lamina dura...
February 17, 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
#14
Gerlig Widmann, Alexander Bischel, Andreas Stratis, Hilde Bosmans, Reinhilde Jacobs, Eva-Maria Gassner, Wolfgang Puelacher, Ruben Pauwels
OBJECTIVES: The objective of this study was to determine how iterative reconstruction technology (IRT) influences contrast and spatial resolution in ultralow-dose dentomaxillofacial CT imaging. METHODS: A polymethyl methacrylate phantom with various inserts was scanned using a reference protocol (RP) at CT dose index volume 36.56 mGy, a sinus protocol at 18.28 mGy and ultralow-dose protocols (LD) at 4.17 mGy, 2.36 mGy, 0.99 mGy and 0.53 mGy. All data sets were reconstructed using filtered back projection (FBP) and the following IRTs: adaptive statistical iterative reconstructions (ASIRs) (ASIR-50, ASIR-100) and model-based iterative reconstruction (MBIR)...
February 17, 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
#15
Chutamas Deepho, Hiroshi Watanabe, Shinya Kotaki, Junichiro Sakamoto, Yasunori Sumi, Tohru Kurabayashi
OBJECTIVES: The purpose of this study was to investigate whether CT/MRI fusion volumetric images can improve the detectability of the mandibular canal (MC) compared with CT alone. METHODS: Images of 31 lesions within or close to the mandible using both multislice 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. Of the 62 hemimandibles, 13 hemimandibles were excluded because the MC passed through a lesion...
February 17, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28045345/quality-assurance-phantoms-for-cone-beam-computed-tomography-a-systematic-literature-review
#16
Marcus V L de Oliveira, Ann Wenzel, Paulo S F Campos, Rubens Spin-Neto
OBJECTIVES: To undertake a systematic review on quality assurance (QA) phantoms for CBCT imaging, including studies on the development and application of phantoms. METHODS: The MEDLINE (PubMed) bibliographic database was searched until May 2016 for studies evaluating the development and use of phantoms in CBCT image QA. 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)...
February 17, 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
#17
Shalva R Gvetadze, Ping Xiong, Mingming Lv, Jun Li, Jingzhou Hu, Konstantin D Ilkaev, Xin Yang, Jian Sun
OBJECTIVES: To assess the usefulness of contrast-enhanced ultrasound (CEUS) with peritumoral injection of microbubble contrast agent for detecting the sentinel lymph nodes for oral tongue carcinoma. METHODS: The study was carried out on 12 patients with T1-2cN0 oral tongue cancer. A radical resection of the primary disease was planned; a modified radical supraomohyoid neck dissection was reserved for patients with larger lesions (T2, n = 8). The treatment plan and execution were not influenced by sentinel node mapping outcome...
February 17, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28045343/a-new-method-to-evaluate-image-quality-of-cbct-images-quantitatively-without-observers
#18
Yohei Takeshita, Mayumi Shimizu, Kazutoshi Okamura, Shoko Yoshida, Warangkana Weerawanich, Kenji Tokumori, Gainer R 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 aluminium step phantom. These phantoms had holes with different depths. They were immersed in water and scanned with a CB MercuRay (Hitachi Medical Corporation, Tokyo, Japan) at tube voltages of 120 kV, 100 kV, 80 kV and 60 kV...
February 17, 2017: 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
#19
Phong D 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%. Owing to 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 the skin, followed by the 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 fluorodeoxyglucose-positron emission tomography/CT...
February 17, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/27910717/dose-optimization-for-assessment-of-periodontal-structures-in-cone-beam-ct-examinations
#20
Ayman Al-Okshi, Chrysoula Theodorakou, Christina Lindh
OBJECTIVES: To investigate the relationship between dose and image quality for a dedicated dental 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 3D Accuitomo 170 (J. Morita, Kyoto, Japan) dental CBCT scanner. The SedentexCT IQ phantom was used to investigate the relationship between contrast-to-noise ratio (CNR) and dose-area product...
February 17, 2017: Dento Maxillo Facial Radiology
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