Question 13; definitions
CTV, which is Clinical Target Volume is the volume of the desired target radiation that is to be delivered to the targeted cells or organs or organ systems.
PTV- Planning Target Volume is the total of the CTV and the margins created to target a particular site in the system involved.
IGRT-Image-Guided Radiation Therapy is the frequent use of imaging techniques in the radiation therapy to bring out the highly desired precision in the diagnosis or treatment results
SRS-Stereotactic Radiosurgery is the treatment technique that, in most cases, targets the brain cells in delivering X-rays doses as a treatment technic.
Margin is the medium used when improving the target delivery of the CTV process
keV-Kiloelectric Volts is a unit of measuring the energy of diagnostic rays used
Question 14
Question 15: cons and pros of
IGRT as a technic has the following pros in the field of radiotherapy. The technique has helped in the development of new treatment methods such as those used in the frameless Central Nervous System. It has also been used to avoid invasive immobilization in treatment processes. Moreover the technique has been used and can be used to treat abnormal growths such as cases of meningioma or benign diseases of the neurology.
However, the technique also has the following cons or shortcomings. It has the tendency of being associated with increased risk of neurotoxicity. It also requires specific and high precise dose delivery techniques that demand high level of expertise. Again, it lacks appropriate data on the correlation of cases and evidences in the treatment process.
