A novel kernel Wasserstein distance on Gaussian measures: An application of identifying dental artifacts in head and neck computed tomography

AbstractObjectiveThis study aimed to evaluate the effectiveness of computed tomography and positron emission tomography-computed tomography prior to salvage surgery after head and neck carcinoma treated with bioradiotherapy and to look at the role of neck dissection in this setting.MethodThis study was a retrospective chart review of a series of consecutive patients with locally advanced head and neck squamous cell carcinoma treated with bioradiotherapy. Radiological and pathological stages were compared to evaluate the accuracy of computed tomography and positron emission tomography-computed tomography in detecting occult neck metastasis in the context of recurrence of primary tumour. In order to assess the impact of neck dissection on survival, Kaplan–Meier survival curves after salvage surgery with and without neck dissection were derived.ResultsA total of 268 patients were identified, of which 22 underwent salvage surgery. The negative predictive value of computed tomography and positron emission tomography-computed tomography was excellent. Neck dissection did not represent an improvement on overall, disease specific and regional recurrence free survival (p = 0.67, p = 0.91 and p = 0.62, respectively) amongst clinically and radiologically negative necks.ConclusionConservative treatment of the neck should be considered when dealing with patients with primary site recurrence or persistent disease after bioradiotherapy without evidence of neck disease.

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Ionizing radiation and its considerations in imaging diagnosis: comparison of absorbed dose between cone beam computed tomography and multi-detector computed tomography in the head and neck

Radioprotection ◽

10.1051/radiopro/2021006 ◽

2021 ◽

Author(s):

P.L.E. Oliveira ◽

C.R. Starling ◽

C.L.P. Maurício ◽

F.R. Guedes ◽

M.A. Visconti ◽

...

Keyword(s):

Computed Tomography ◽

Head And Neck ◽

Cone Beam Computed Tomography ◽

Absorbed Dose ◽

Cone Beam ◽

Thermoluminescent Dosimeters ◽

Organ Tissue ◽

The Mean ◽

Average Adult ◽

Multi Detector Computed Tomography

Introduction: The objective of this study was to compare the mean absorbed dose in patients undergoing head and neck examinations using two cone beam computed tomography (CBCT, Kodak and i-CAT) and one multi-detector computed tomography (MDCT). Methods: Three thermoluminescent dosimeters (TLDs), calibrated in air kerma, were positioned in 24 regions of the head and neck of a phantom simulating an average adult. The mean absorbed dose (mGy) values in these positions, for different organs and tissues, were obtained using correction factors, considering the ratio between the mass energy absorption coefficients of organ/tissue and air. Comparison between radiation doses in the most radiosensitive regions was done by calculating the ratio of these dose values, with propagated uncertainty. Results: The dose in all regions was significantly higher for MDCT when compared to CBCT. Concerning CBCT equipment, the Kodak device had a higher absorbed dose than the i-CAT for most of the regions tested. The uncertainty of the i-CAT was greater than that of the Kodak. Conclusion: Due to the considerable difference between absorbed doses, emphasizing the higher dose values obtained in MDCT, the dissemination of CBCT application in medicine is recommended, as well as further studies to broaden the criteria for use.

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Preliminary Computed Tomography Radiomics Model for Predicting Pretreatment CD8+ T-Cell Infiltration Status for Primary Head and Neck Squamous Cell Carcinoma

Journal of Computer Assisted Tomography ◽

10.1097/rct.0000000000001149 ◽

2021 ◽

Vol Publish Ahead of Print ◽

Author(s):

Colin Y. Wang ◽

Daniel Thomas Ginat

Keyword(s):

Computed Tomography ◽

Squamous Cell Carcinoma ◽

T Cell ◽

Cell Carcinoma ◽

Head And Neck ◽

Squamous Cell ◽

Cd8 T Cell ◽

Neck Squamous Cell Carcinoma ◽

Cell Infiltration ◽

T Cell Infiltration

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Asymptomatic Presentation of Aggressive Ossifying Fibroma:A Case Report

Case Reports in Dentistry ◽

10.1155/2011/523751 ◽

2011 ◽

Vol 2011 ◽

pp. 1-4 ◽

Cited By ~ 2

Author(s):

Roopashri Rajesh Kashyap ◽

Gopakumar R. Nair ◽

Subhas Babu Gogineni

Keyword(s):

Computed Tomography ◽

Case Report ◽

Head And Neck ◽

Clinical Symptoms ◽

Neck Region ◽

Ethmoid Sinus ◽

Ossifying Fibroma ◽

Head And Neck Region ◽

Aggressive Form ◽

Aggressive Tumors

Ossifying fibromas form a part of the spectrum of fibro-osseous lesions of the jaws. They are rare, benign, nonaggressive tumors that are commonly seen in head and neck region. This paper presents the case of a 40-year-old female patient presented with minimal clinical symptoms, diagnosed to be suffering from aggressive form of ossifying fibroma of maxilla involving the maxillary sinus and ethmoid sinus. This paper emphasizes the importance of computed tomography in diagnosing such unapparent aggressive tumors.

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