Tracer studies are retrospective analyses of samples in order to evaluate long term impact of intervention programs. The results of tracer studies highlight circumstances that produce meaningful change in populations.Continue Reading
A tracer study helps researchers identify effective and ineffective components in educational and vocational programs. The results of tracer studies are quantitative and the data is easy to analyze. A tracer study in the field of education includes data from former students of learning institutions or vocational programs. The format of a tracer study is often a questionnaire. According to the manual for creating tracer studies by the international cooperative, Helvetas, effective tracer studies are short questionnaires with clear questions, ask for recommendations and use both quantitative and qualitative questions. Tracer studies are most effective when the samples are random and include annual collection of data. Researchers administer tracer studies to the sample groups between nine to 12 months after graduation from the measured program.
Tracer studies are common research tools for educational and training programs. These impact assessment tests help identify the strengths and weaknesses of the programs they measure. The institutions use the results of tracer studies to improve education and training programs as well as enhance the learning experiences of future learners.Learn more about Diagnostics & Imaging
A positron emission tomography scan is conducted by administering a radioactive tracer chemical to the patient and using a full-body scanner to detect how the substance interacts with tissues, organs and blood, states MedlinePlus. The radioactive signals tracked by the scanner are converted into electronic images.Full Answer >
Normal bone scan results show radioactive tracer that moves evenly through all bones, and abnormal results show hot or cold spots, says MedlinePlus. Hot spots indicate areas that have taken up more tracer, and cold spots show areas that have taken up less. Results must be compared with other images.Full Answer >
During a nuclear medicine bone scan, a technologist injects a small amount of a radioactive substance known as a tracer into the patient's vein, and a specialized camera takes pictures of the bones once they have absorbed the tracer, according to Cancer.net. No special preparations are necessary prior to the procedure, and the patient is able to return to his normal activities immediately after completion. The test indicates whether the patient has bone damage due to cancer or other diseases.Full Answer >
A PET scan uses a moving camera that records the movement of a tracer through the body, turning the recording into pictures on a computer, explains WebMD. An MRI is a test that produces very clear pictures of the human body using a large magnet, radio waves and a computer.Full Answer >