Related Experiment Video
Updated: May 17, 2026

Image Rendering Techniques in Postmortem Computed Tomography: Evaluation of Biological Health and Profile in Stranded Cetaceans
Published on: September 27, 2020
A survey of computed tomography imaging techniques and patient dose in Kenya
J S Wambani1, G K Korir, E G Onditi
1Radiology Department, Kenyatta National Hospital, P.O. Box 20723-00202, Nairobi, Kenya.
Objectives:
To assess the level of patient dose in Computed Tomography examination in Kenya, compare with the international diagnostic reference levels and establish the initial national diagnostic reference levels.
Design:
The patient doses for brain, chest, abdomen and pelvis examinations were assessed using typical exposure factors on head and body dosimetry phantoms. A log normal graphical method was developed and used in deriving the initial national diagnostic reference levels for the two dose quantities.
Setting:
Twenty one representative Computed Tomography facilities at different hospitals and clinics.
Subjects:
A questionnaire method was developed and used in recording the scanning parameters for head, chest, abdomen and pelvis adult examinations at each facility.
Results:
The radiation exposure from Computed Tomography examinations was determined to be below the weighted Computed Tomography Dose Index (CTDIw) and Dose Length Product (DLP) reference levels by 90% and 62% respectively.
Conclusion:
The mean CTDIw measurements for the adult patients were below Diagnostic Reference levels (DRLs). The mean DLP values for adult patients in some examination were above DRLs, with large variations of up to a factor of eleven. This indicates the need for local optimised scanning protocols and use of local diagnostic reference level in order to reduce patient doses without affecting diagnostic image quality.
Related Concept Videos
Computed Tomography
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
Imaging Studies III: Computed Tomography
Radiological Investigation I: X-ray and CT
Imaging Studies I: CT and MRI
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
Imaging Studies for Cardiovascular System V: CT
X-ray Imaging

