dc.contributor.author |
Tamam, Nissren Mohamed Ahmed |
|
dc.contributor.author |
supervisor-bdelmoneim Adam Mohamed |
|
dc.date.accessioned |
2013-09-05T09:54:15Z |
|
dc.date.available |
2013-09-05T09:54:15Z |
|
dc.date.issued |
2012-03-01 |
|
dc.identifier.citation |
Tamam,Nissren Mohamed Ahmed.Optimization of Radiation Dose in CT Chest Examination/Nissren Mohamed AhmedTamam; Abdalmoneim Adam .- Khartoum : sudan Universty of science and technology, Medical Radiologic Science,2012 .- 69p .: ill . ;28cm .- M.Sc. |
en_US |
dc.identifier.uri |
http://repository.sustech.edu/handle/123456789/1466 |
|
dc.description |
Thesis |
en_US |
dc.description.abstract |
Computed tomography (CT) examinations can involve relatively high doses to patients.
The doses can often approach or exceed levels known with certainty to increase the probability
of cancer. Therefore, optimisation of patient dose is crucial. The objectives of this study were to:
(i) measure the radiation dose for patient during 64 slices CT Chest scan, (ii) optimize the
radiation dose and (iii) estimate the lifetime attributable to risk of cancer.
A total of 50 patient divided into two groups one as control group (A) (38 patients) and
optimization group (B) (12 patients).Group A were performed with the own department protocol
using 64 slice CT Scan (Toshiba, Aquilion) in Al-Amal national Hospital, Khartoum North, and
group (B) the optimized group were performed by the optimized technique increasing the pitch
factor. Data were collected to study the effects of patient-related parameters, exposure-related
parameters. The organ dose conversion factor f (organ, z) was obtained from the NRPB datasets
(NRPB-SR279) based on the Monte Carlo simulations.
The mean CTDIvol was 21.17 mGy and DLP was 839 mGy. cm for group A and CTDI vol
was 8.3 mGy and DLP was 239.67 in group (B). The effective dose for group A was 14.6 mSv
and for group B was 5.7 mSv. The probability of overall cancer risk was estimated to be 267 per
million The relative high dose in group( A) may be due to many factors such as operators and
practitioners are insufficiently educated in newly emerging technology, or patient related factors.
The mean organ doses in this study were mostly comparable (group B) to and slightly higher
(group A) than reported values from the developed countries. Proper justification of
examinations, use of the appropriate technical parameters during examinations, proper quality
control, and application of diagnostic reference levels of dose as appropriate would reduce the
patient radiation during CT examination |
en_US |
dc.description.sponsorship |
sudan university of science and technology |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
sudan Universty of science and technology |
en_US |
dc.subject |
chest- examinations |
en_US |
dc.title |
Optimization of Radiation Dose in CT Chest Examination |
en_US |
dc.type |
Thesis |
en_US |