Publications by authors named "Chrysoula Theodorakou"
Article Synopsis
- * 48 teeth were imaged with various X-ray exposure settings, and the diagnostic accuracy was evaluated by five dental radiologists, who assessed both fractures and image quality.
- * Results indicated that a dose reduction of about 20% could be achieved without compromising diagnostic accuracy, and higher resolution settings did not significantly enhance image quality.
Article Synopsis
- The debate over the use of patient contact-shielding in X-ray imaging is ongoing, with some studies questioning its effectiveness and noting inconsistencies in how it's applied.
- The review examines guidelines from various national and international sources regarding shielding in different imaging contexts, focusing on both adult and pediatric patients.
- Overall, shielding is only advised when it doesn't interfere with diagnostic accuracy or when it provides reassurance to patients, highlighting the need for a clear, evidence-based consensus on its use.
The aim of the guideline presented in this article is to unify the test parameters for image quality evaluation and radiation output in all types of cone-beam computed tomography (CBCT) systems. The applications of CBCT spread over dental and interventional radiology, guided surgery and radiotherapy. The chosen tests provide the means to objectively evaluate the performance and monitor the constancy of the imaging chain.
View Article and Find Full Text PDFDose optimization for assessment of periodontal structures in cone beam CT examinations.
Dentomaxillofac Radiol
March 2017
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.
Objective: The aim of this study was to develop a low-dose protocol suitable for cone beam CT (CBCT) examination of an impacted maxillary canine in children by using a combination of dosimetry with subjective and objective image quality assessment.
Methods: Radiation dose and image quality measurements were made using a dental CBCT machine. An image quality phantom was used to investigate the relationship between objective image quality and dose-area product (DAP) for a broad range of exposure settings.
Background: There is limited evidence about the use of cone-beam computed tomography (CBCT) in paediatric dentistry. Appropriate use of CBCT is particularly important because of greater radiation risks in this age group.
Aim: To survey the use of CBCT in children and young people in three Dental Hospitals in the United Kingdom (UK), with special attention paid to aspects of justification and optimisation.
Objective: To estimate the absorbed organ dose and effective dose for a wide range of cone beam computed tomography scanners, using different exposure protocols and geometries.
Materials And Methods: Two Alderson Radiation Therapy anthropomorphic phantoms were loaded with LiF detectors (TLD-100 and TLD-100 H) which were evenly distributed throughout the head and neck, covering all radiosensitive organs. Measurements were performed on 14 CBCT devices: 3D Accuitomo 170, Galileos Comfort, i-CAT Next Generation, Iluma Elite, Kodak 9000 3D, Kodak 9500, NewTom VG, NewTom VGi, Pax-Uni3D, Picasso Trio, ProMax 3D, Scanora 3D, SkyView, Veraviewepocs 3D.
The motivation behind this study is to assess whether angular dispersive x-ray diffraction (ADXRD) data, processed using multivariate analysis techniques, can be used for classifying secondary colorectal liver cancer tissue and normal surrounding liver tissue in human liver biopsy samples. The ADXRD profiles from a total of 60 samples of normal liver tissue and colorectal liver metastases were measured using a synchrotron radiation source. The data were analysed for 56 samples using nonlinear peak-fitting software.
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