Language：Japanese   Publisher：(NPO)日本歯科放射線学会  

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Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

OBJECTIVE: The first aim of this study was to evaluate the diagnostic ability of [F]-fluorodeoxyglucose-PET/computed tomography (FDG-PET/CT) for retropharyngeal lymph node (RPLN) metastasis in patients with oral cancer. The second was to compare this with those of CT and MRI. METHODS: Among patients examined by both FDG-PET/CT and morphological imaging such as CT and MRI within 1 month, 42 patients (24 males and 18 females, mean age: 63.5 years; age range: 26-94 years) with a final diagnosis of retropharyngeal lymph node were included in this study. The diagnostic abilities for RPLN metastasis were evaluated by maximum standardized uptake value on PET/CT images and short axis diameter on morphological images. Optimal cut-off values for the nodal diagnoses of these modalities were obtained by receiver operating characteristic (ROC) analysis. RESULTS: In the ROC analysis, PET/CT had the largest area under the curve (AUC = 0.903), and diagnostic ability was superior to morphological images such as CT (0.678) and MRI (0.707). Using a maximum standardized uptake value of 3.5 as the cut-off value, sensitivity of 83.3%, specificity of 100% and accuracy of 95.2% were obtained. CONCLUSION: The diagnostic ability of FDG-PET/CT for RPLN metastasis was superior to CT and MRI. FDG-PET/CT is considered a useful tool for the diagnosis of RPLN in patients with oral cancer.

DOI： 10.1097/MNM.0000000000001071

PubMed

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Authorship：Lead author   Language：English   Publisher：昭和大学学士会  

顎関節疾患の診断において、MRI画像での皮質骨と顎関節円板の信号強度測定の妥当性について検討した。第1の検討として、ボランティア9名(男性5名、女性4名、平均28.8歳)の両顎関節をマルチエコー法で撮像して13の顎関節円板画像を入手し、皮質骨および顎関節円板の信号強度がエコー時間(TE)によってどのように変化するか調べた。第2の検討として、顎関節症が疑われて両側顎関節のMRIを施行した患者28名(男性8名、女性20名、平均33.8歳)より30顎関節のプロトン密度強調像(PDWI)とT2強調像(T2WI)を抽出し、皮質骨および顎関節円板の信号強度が明らかに無信号となる外耳孔と比較して有意に高いかどうか調べた。第1の検討の結果、前方肥厚部と後方肥厚部はほぼ同等の減衰を示した。関節突起皮質骨と円板の信号強度はTE 20ms付近で交差し、それより短いTEでは円板が、長いTEでは皮質骨が高信号を示した。第2の検討では、PDWIとT2WIは同様の結果であり、関節突起皮質骨、円板前方肥厚部、後方肥厚部の信号強度は空気の信号強度より有意に高値を示した。これまで無信号または低信号と考えられてきた皮質骨および顎関節円板は、空気とは異なり、それぞれ特徴的な信号を呈することが明らかになった。

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Other Link： https://search.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2017&ichushi_jid=J04669&link_issn=&doc_id=20180420270007&doc_link_id=10.15369%2Fsujms.29.415&url=https%3A%2F%2Fdoi.org%2F10.15369%2Fsujms.29.415&type=J-STAGE&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00007_3.gif

Language：English   Publishing type：Research paper (scientific journal)  

PURPOSE: To assess the feasibility of applying diffusion kurtosis imaging (DKI) to common odontogenic lesions and to compare its diagnostic ability versus that of the apparent diffusion coefficient (ADC) for differentiating keratocystic odontogenic tumors (KCOTs) from odontogenic cysts. MATERIALS AND METHODS: Altogether, 35 odontogenic lesions were studied: 24 odontogenic cysts, six KCOTs, and five ameloblastomas. The diffusion coefficient (D) and excessive kurtosis (K) were obtained from diffusion-weighted images at b-values of 0, 500, 1000, and 1500 s/mm2 on 3T magnetic resonance imaging (MRI). The combination of D and K values showing the maximum density of the probable density function was estimated. The ADC was obtained (0 and 1000 s/mm2 ). Values for odontogenic cysts, KCOTs, and ameloblastomas were compared. Multivariate logistic regression modeling was performed to assess the combination of D and K model versus ADC for differentiating KCOTs from odontogenic cysts. RESULTS: The mean D and ADC were significantly higher for ameloblastomas than for odontogenic cysts or KCOTs (P < 0.05). The mean K was significantly lower for ameloblastomas than for odontogenic cysts or KCOTs (P < 0.05). The mean values of all parameters for odontogenic cysts and KCOTs showed no significant differences (P = 0.369 for ADC, 0.133 for D, and 0.874 for K). The accuracy of the combination of D and K model (76.7%) was superior to that of ADC (66.7%). CONCLUSION: Use of DKI may be feasible for common odontogenic lesions. A combination of DKI parameters can be expected to increase the accuracy of its diagnostic ability compared with ADC. J. Magn. Reson. Imaging 2016;44:1565-1571.

DOI： 10.1002/jmri.25307

PubMed

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Language：English   Publishing type：Research paper (scientific journal)  

OBJECTIVES: Recent developments in digital computer technology have enabled radiological diagnosis to be performed using a monitor screen. In medical radiography, the importance of monitors has been shown in many diseases. Digital imaging and communication in medicine (DICOM)-compatible monitors are widely used. However, the effect of monitors on the diagnosis of oral disease has not yet been clarified and remains controversial. The aims of this study are to compare the caries diagnostic ability between DICOM monitors and other monitors and to examine if monitor capability affects the diagnosis. MATERIALS AND METHODS: One hundred proximal surfaces of 50 extracted human upper premolar teeth were used as specimens. Intra-oral radiographs of all specimens were taken digitally. Three types of monitors were compared in terms of caries diagnostic ability: a DICOM standard-compatible monitor, a standardized personal computer (PC) monitor, and a tablet PC. Six oral radiologists diagnosed each radiograph independently. Areas under the receiver operating characteristic (ROC) curve were generated and compared. RESULTS: Area under the ROC curve (AUC) of the DICOM monitor, PC monitor, and tablet PC was 0.68147, 0.67002, and 0.60189, respectively. There was no significant difference between the DICOM monitor and the PC monitor, but the tablet PC showed significantly lower accuracy. There were no significant differences among the monitors for dentin caries (p > 0.05). CONCLUSIONS: DICOM-compatible monitors and PC monitors have similar capabilities, but tablet PCs showed lower diagnostic accuracy, especially for superficial caries. CLINICAL RELEVANCE: Appropriate monitors are needed for radiographic diagnosis on monitor screens.

DOI： 10.1007/s00784-015-1401-z

PubMed

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Language：English   Publishing type：Research paper (scientific journal)  

AIMS: The purpose of the present study is to analyze the fluid-attenuated inversion recovery (FLAIR) signal intensity of the retrodiscal tissue in a painful temporomandibular joint (TMJ), and to develop a diagnostic system based on FLAIR data. METHODOLOGY: The study was based on 33 joints of 17 patients referred for MR imaging of the TMJ. Regions of interest were placed over retrodiscal tissue and gray matter (GM) on FLAIR images. Using signal intensities of GM as reference points, signal intensity ratios (SIR) of retrodiscal tissue were calculated. SIRs in painful TMJ were compared with those in painless TMJ. Wilcoxon's Rank Sum Test was used to analyze the difference in SIRs between the painful and painless groups (P<0·05). RESULTS: The SIRs of retrodiscal tissue were significantly higher in painful joints than in painless joints. CONCLUSION: FLAIR sequences provide a high signal in patients having painful TMJ, and it suggests that retrodiscal tissue in painful TMJ contains elements such as protein.

DOI： 10.1080/08869634.2015.1097295

PubMed

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Language：English  

DOI： 10.1111/pin.12212

PubMed

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Language：Japanese   Publisher：(公社)日本歯科医師会  

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Language：Japanese   Publisher：(一社)日本病理学会  

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Language：Japanese   Publisher：岡山歯学会  

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Language：English   Publisher：(一社)日本核医学会  

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Language：Japanese   Publisher：昭和大学学士会  

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Language：Japanese   Publisher：(公社)日本医学放射線学会  

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Language：Japanese   Publisher：(NPO)日本歯科放射線学会  

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Language：Japanese   Publisher：(NPO)日本歯科放射線学会  

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Language：Japanese   Publisher：(NPO)日本歯科放射線学会  

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Language：Japanese   Publisher：(一社)日本顎関節学会  

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Language：Japanese   Publisher：医歯薬出版(株)  

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J-GLOBAL

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Event date： 2023.4.13 - 2023.4.16

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Event date： 2023.1.26 - 2023.2.28

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2023.1.26 - 2023.2.28

Language：Japanese   Presentation type：Poster presentation  

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Event date： 2022.11.26

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Event date： 2022.10.7 - 2022.10.9

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Event date： 2022.10.7 - 2022.10.9

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Event date： 2022.10.7 - 2022.10.9

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2022.9.22 - 2022.9.24

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Event date： 2022.6.3 - 2022.6.4

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Event date： 2021.10.29 - 2021.10.31

Language：Japanese   Presentation type：Oral presentation (general)  

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Event date： 2021.9.23 - 2021.9.25

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Event date： 2021.5.21 - 2021.5.23

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Event date： 2021.4.28 - 2021.5.1

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Event date： 2021.4.22 - 2021.4.24

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Event date： 2020.10.31 - 2020.11.1

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Event date： 2020.10.18

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