Author: Md. Moniruzzaman
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659582066
Category :
Languages : en
Pages : 72
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Book Description
In the case of computed tomography (CT) scan, the measurement of effective dose is very essential. A patient size-dependent factor will be used to estimate patient dose from scanner output indices (e.g. Computed tomography dose index, CTDIvol) for patients of different sizes. The size dependent factor shall be used over a range of patient sizes, and extends to large patients as well as small patients.This research performed the estimation of effective dose during CT scan of brain of patients by using PMMA 32 cm reference phantom for treatment planning. The effective dose has been calculated for different patients after CT scan of head or brain. To estimate the effective dose different parameters like anterior posterior (AP), lateral (LAT), AP+LAT dimension, effective diameter, dose length product (DLP) and size specific dose estimate (SSDE) have been calculated. The calculated value of effective dose was in the range of (346-587) mSv. The relations of effective diameter with AP, LAT, AP+LAT dimension, SSDE and age of the patients have been analyzed.
Author: John Boone
Publisher:
ISBN: 9781936366088
Category :
Languages : en
Pages :
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Book Description
Author: D. Tack
Publisher: Springer Science & Business Media
ISBN: 3540685758
Category : Medical
Languages : en
Pages : 275
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Book Description
This book considers in depth all the factors that influence the radiation dose and the risk associated with MDCT in children and adults. Only a small proportion of referring clinicians, radiologists, and technologists are aware of both the radiation risks and their underlying mechanisms. The book proposes detailed guidelines for optimization of the radiation dose when using MDCT. It is written by experts of international standing.
Author: Alan Daneman
Publisher: Springer Science & Business Media
ISBN: 1447131371
Category : Medical
Languages : en
Pages : 373
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Book Description
Pediatric body CT began in earnest in 1976 when for the first time a body CT machine was installed in a pediatric institution, the Hospital for Sick Children in Toronto. The first images were received with great enthusiasm. More recently, newer equipment with faster scan times and better resolution has enabled us to delineate disease processes with even greater accuracy. In the past 9 years we have performed more than 5000 body scans in children. With this experience our examination techniques have changed and the indications for CT in children have been modified. CT has come to occupy an important and specific place in the management of pediatric patients. The performance of body CT studies in children is not always easy. Excellent diagnostic studies can be obtained only with a special understanding of the problems of pediatric patients and pediatric pathology. The information contained herein is a review of our experience with pediatric body CT, how we use body CT in children, and its relationship to other modalities in this department.
Author: Leonard M. Freeman
Publisher:
ISBN:
Category : Medical
Languages : en
Pages : 232
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Book Description
Author: Marilyn J. Siegel
Publisher: Lippincott Williams & Wilkins
ISBN: 9780781775403
Category : Medical
Languages : en
Pages : 500
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Book Description
Dr. Siegel's definitive reference on pediatric body CT is now in its Second Edition—thoroughly revised to reflect the latest techniques and the growing use of CT for pediatric patients. Chapters provide detailed, practical protocols for cardiac, vascular, thoracic, abdominal, pelvic, and musculoskeletal imaging and thoroughly describe and illustrate normal anatomy and pathologic findings. The book contains over 1,100 images obtained with state-of-the-art technology, including many three-dimensional images. This edition's new chapter on cardiac and vascular imaging demonstrates the utility of CT as a powerful diagnostic tool for cardiac anomalies. A full-color insert depicting vascular and cardiac anomalies is also included. A companion Website offers the fully searchable text and a full-color online image bank. (www.pediatricbodyct.com)
Author: Colin J. Martin
Publisher: Oxford University Press, USA
ISBN: 0199655219
Category : Medical
Languages : en
Pages : 551
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Book Description
Written by practitioners experienced in the field, 'Practical Radiation Protection in Healthcare' provides a practical guide for medical physicists and others involved with radiation protection in the healthcare environment.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Abstract : Abstract: Children are at greater risk of radiation exposure than adults because the rapidly dividing cells of children tend to be more radiosensitive and they have a longer expected life time in which to develop potential radiation injury. Some studies have surveyed computed tomography (CT) radiation doses and several studies have established diagnostic reference levels according to patient age or body size; however, no survey of CT radiation doses with a large number of patients has yet been carried out in South Korea. The aim of the present study was to investigate the radiation dose in pediatric CT examinations performed throughout South Korea. From 512 CT (222 brain CT, 105 chest CT, and 185 abdominopelvic CT) scans that were referred to our tertiary hospital, a dose report sheet was available for retrospective analysis of CT scan protocols and dose, including the volumetric CT dose index (CTDIvol ), dose-length product (DLP), effective dose, and size-specific dose estimates (SSDE). At 55.2%, multiphase CT was the most frequently performed protocol for abdominopelvic CT. Tube current modulation was applied most often in abdominopelvic CT and chest CT, accounting for 70.1% and 62.7%, respectively. Regarding the CT dose, the interquartile ranges of the CTDIvol were 11.1 to 22.5 (newborns), 16.6 to 39.1 (≤1 year), 14.6 to 41.7 (2–5 years), 23.5 to 44.1 (6–10 years), and 31.4 to 55.3 (≤15 years) for brain CT; 1.3 to 5.7 (≤1 year), 3.9 to 6.8 (2–5 years), 3.9 to 9.3 (6–10 years), and 7.7 to 13.8 (≤15 years) for chest CT; and 4.0 to 7.5 (≤1 year), 4.2 to 8.9 (2–5 years), 5.7 to 12.4 (6–10 years), and 7.6 to 16.6 (≤15 years) for abdominopelvic CT. The SSDE and CTDIvol were well correlated for patients
Author: Juerg Hodler
Publisher: Springer
ISBN: 3030111490
Category : Medical
Languages : en
Pages : 238
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Book Description
This open access book focuses on diagnostic and interventional imaging of the chest, breast, heart, and vessels. It consists of a remarkable collection of contributions authored by internationally respected experts, featuring the most recent diagnostic developments and technological advances with a highly didactical approach. The chapters are disease-oriented and cover all the relevant imaging modalities, including standard radiography, CT, nuclear medicine with PET, ultrasound and magnetic resonance imaging, as well as imaging-guided interventions. As such, it presents a comprehensive review of current knowledge on imaging of the heart and chest, as well as thoracic interventions and a selection of "hot topics". The book is intended for radiologists, however, it is also of interest to clinicians in oncology, cardiology, and pulmonology.
Author: Dona May O. Taguba
Publisher:
ISBN:
Category :
Languages : en
Pages : 54
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Book Description
Pediatric patients have higher risk of cancer than adult patients when exposed to Computed Tomography (CT) radiation. This study intends to contributeto the establishment of national diagnostic reference level for CT doses that will be used for the radiation protection of patients. The CT Machine specifications were listed the scanning parameters of the CT scanning machines during the chest and abdominal CT examination and demographic profiles of pediatric patients whose ages are between 0-15 years were noted. The CTDIw for chest and abdominal CT are measured using a 16cm diameter body equivalent acrylic phantom and Unfors pencil type ioniization chamber. The DLP and DLP slice were computed using the measured CTDIw and the phantom data. the effective dose was also estimated for both procedures. The summary of results of CTDIw showed that the dose received by pediatric patients im age groups 1, 2, and 3 received the same dose of 18.038 mGy and 20.43 mGy was received by patient age group 4. The total DPL values are the same for age groups 1-3. The value of 270.6 mGy-cm is 32.4% lower in age groups 2, 55% lower in group 3 and a value of 306.4 mGy-cm is 45.2% lesser in age group 4. All these values are within the initial diagnostic reference level. On the contry, Age group 1 has a computed DLP of 270.6 mGy-cm which is 35.3 higher than the initial diagnostic reference level. The results showed that 0 year old patients are at risk the most since the computed effective doses are not within the initial reference values of adjustments were not made according to patient's age. Without sacrificing the image quality, this suggests the patients can receive lower radiation doses if necessary modifications would be made. Thus risks from effects of CT radiation can be minimized.
