Determination of the Effect of Patient-Specific Bladder Filling Protocol for Operated Prostate Cancer Patients on Bladder Volume and Doses Using Cone Beam Computed Tomography Dose Calculations

Modern dentistry commonly uses a variety of imaging methods to support diagnosis and treatment. Among them, cone beam computed tomography (CBCT) is particularly useful in presenting head structures, such as the temporomandibular joint (TMJ). The determination of the morphology of the joint is an important part of the diagnosis as well as the monitoring of the treatment results. It can be accomplished by measurement of the TMJ gap width at three selected places, taken at a specific cross-section. This study presents a new approach to these measurements. First, the CBCT images are denoised using curvilinear methods, and the volume of interest is determined. Then, the orientation of the vertical cross-section plane is computed based on segmented axial sections of the TMJ head. Finally, the cross-section plane is used to determine the standardized locations, at which the width of the gap between condyle and fossa is measured. The elaborated method was tested on selected TMJ CBCT scans with satisfactory results. The proposed solution lays the basis for the development of an autonomous method of TMJ index identification.

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Study to compare the effect of different registration methods on patient setup uncertainties in cone-beam computed tomography during volumetric modulated arc therapy for breast cancer patients

Journal of Medical Physics ◽

10.4103/jmp.jmp_67_18 ◽

2018 ◽

Vol 43 (4) ◽

pp. 207 ◽

Cited By ~ 1

Author(s):

D Khanna ◽

P Mohandass ◽

TManoj Kumar ◽

T Thiyagaraj ◽

C Saravanan ◽

...

Keyword(s):

Breast Cancer ◽

Computed Tomography ◽

Cancer Patients ◽

Cone Beam Computed Tomography ◽

Volumetric Modulated Arc Therapy ◽

Cone Beam ◽

Breast Cancer Patients ◽

Arc Therapy ◽

Patient Setup

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Age- and sex-related changes of the volume of maxillary sinuses quantified via cone beam computed tomography

Research Society and Development ◽

10.33448/rsd-v10i14.22220 ◽

2021 ◽

Vol 10 (14) ◽

pp. e312101422220

Author(s):

Lucas Eigi Borges Tanaka ◽

Ademir Franco ◽

Rafael Ferreira Abib ◽

Luiz Roberto Coutinho Manhães-Junior ◽

Sergio Lucio Pereira de Castro Lopes

Keyword(s):

Computed Tomography ◽

Cone Beam Computed Tomography ◽

Three Dimensional ◽

Specific Treatment ◽

Cone Beam ◽

Patient Specific ◽

Sample Collection ◽

Left And Right ◽

Age And Sex ◽

Maxillary Sinuses

Anatomical studies found in cone beam computed tomography (CBCT) an optimal resource for the three-dimensional (3D) assessment of the head and neck. When it comes to the maxillary sinuses, CBCT enables a life-size reliable volumetric analysis. This study aimed to assess the age and sex-related changes of the maxillary sinuses using volumetric CBCT analysis. The sample consisted of CBCT scans of 112 male (n = 57) and female (n = 55) individuals (224 maxillary sinuses) distributed in 5 age categories: 20 |— 30, 31 |— 40, 41 |— 50, 51 |— 60 and > 60 years. Image acquisition was accomplished with the i-CAT Next Generation device set with voxel size of 0.25 mm and field of view that included the maxillary sinuses (retrospective sample collection from an existing database). Image segmentation was performed in itk-SNAP (www.itksnap.org) software. The volume (mm3) of the segmented sinuses was quantified and compared pairwise based on side (left and right), sex (male and female) and age (five groups). Differences between left and right sides volume were not statistically significant (p > 0.05). The mean volume of maxillary sinuses in males was 22% higher than females (p = 0.0001). Volumetric differences were not statistically significant between age categories for males and females (p > 0.05). The discriminant power of sinuses’ volume may support customized and patient-specific treatment planning based on sex.

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