Prior to scanning, thermoluminescent dosimeters TLDs were placed at 4 sites: The role of imaging is to define the tumor extension, nodal involvement, metastases and recurrences in the postoperative patient.
Start delay greater than 60—70 sec. Results Our results were divided in: The images were reviewed by 3 radiologists. The images were reviewed and scored only once by the three radiologists. One patient was excluded from the analysis of this study due to incomplete CT image acquisition and inaccurate radiation dose measurement.
Since the last 30 years endosseous implants are a well established treatment technique in maxillofacial surgery. Mucosa was considered to be normal if it was not visible and was considered abnormal thickened if it was visible. The linearity of these TLDs was tested over the range of mR to mR and the results showed a good linear fit with a coefficient of determination R2 of 0.
However, the known disadvantage of CT imaging is the radiation exposure and the most radiosensitive organs within the scanning field are the thyroid gland and the eye lens, in which the latter organ is at risk for radiation induced cataract [ 6 - 7 ]. This ionization chamber system was calibrated annually by the Malaysian Nuclear Agency which is the Secondary Standard Dosimetry Laboratory.
The calculated response of the TLDs from tube voltage kV was taken as the calibration factor in this study. Thus, CT has become the method of choice for confirming and determining the extent of the disease.
Find articles by M. Slice thickness are as follows: In patients suspected to have acute sinusitis, this stage is usually treated medically and radiological investigation is rarely required.
La TC e la RM sono le indagini diagnostiche di prima istanza; entrambe presentano vantaggi e svantaggi, ma insieme risultano complementari. Plain films are inadequate for the assessment of sinus masses and a combination of CT and MR is required 45. The TLD readings of each patient were carried out after the scanning and calculations of the equivalent dose to the eyes and thyroid gland were done.
The physical examination should include a fiber optic endoscopic evaluation. Implants are used in the rehabilitation of Patients having lost parts of maxilla or mandible due to tumor surgery or which due to radiotherapy have problems tolerating mucosaborne dentures 2.
The frontal and sphenoethmoidal recesses were considered abnormal if the recesses were not seen to be patent. SUMMARY The aim of this study is to describe the current role of imaging in pre-surgical planning, reporting 25 cases of paranasal sinus tumors examined in our Institute.
Secondly, the following important and clinically relevant anatomical structures of the nasal cavities and paranasal sinuses were assessed: For each scan, scores for the diagnostic image quality were then added together to achieve an overall quality rating.
The study revealed that the mean lengths of right Rt lines 1, 3, 4, 5 and 6 and left lines Lt 1 and 4 of the sphenoid sinus were significantly larger in males than in females.
CT-PET can be used to stage the primary tumor including nodal involvement and distant metastases, to assess the response to treatment and look for recurrence 67. This progression has been possible by the detailed information provided by imaging techniques 3.
The parametric paired sample t-test was used as the test of significance for the comparison between the radiation doses entrance surface dose measured by the TLD during CT scanning of the paranasal sinuses using standard-dose and low-dose protocol, respectively.
Patients were grouped into the following stages: Materials and methods Between june and maywe identified 25 Patients with malignant tumors of the paranasal sinuses. Plain radiographs are inadequate and rarely used.
Inclusion and exclusion criteria The patients who were scheduled for non-contrasted CT scanning of the paranasal sinuses were those suspected to have chronic sinusitis or recurrent chronic sinusitis or nasal polyp. The aim of the present work has been to determine the accuracy of using the measurements of paranasal sinuses as a method for sex estimation, which uses Multi Detector Computed Tomography MDCT.
Specifically, we compare the diagnostic image quality and the delineation of the important and clinically relevant anatomical details of the nasal cavities and paranasal sinuses between low-dose and standard-dose MDCT scanning of the paranasal sinuses.CT scanning of the paranasal sinuses: axial helical CT with reconstruction in the coronal direction versus coronal helical CT.
The British Journal of Radiology, Vol. 71, No. Functional Anatomy and Computed Tomography Imaging of the Paranasal Sinuses. Based on the statistical values it can be inferred that multi detector computed tomography is useful to characterize paranasal sinuses lesions and also delineation of anatomical location, extension and.
The role of multi-detector CT dacryocystography in the assessment of naso-lacrimal duct obstruction Article (PDF Available) in Egyptian Journal of Radiology and Nuclear Medicine 43(3)– Most recently, multi-detector row CT with increased spatial resolution, with INTRODUCTION The head and neck radiology, similar to that of other plain radiographs still have a limited role in the imaging of the paranasal sinuses and are used as the initial technique before the.
title: role of multi-detector computed tomography in paranasal sinuses pathology. Introduction: This statement describes the purpose, procedures, benefits, risks and discomforts of the study and your right to withdraw from the study at any point of time.
Purpose. To compare the image quality of the low-dose to the standard-dose protocol of MDCT scanning of the paranasal sinuses, based on subjective assessment and determine the radiation doses to the eyes and thyroid gland and dose reduction between these two protocols.Download