What is target volume definition in radiotherapy?
What is target volume definition in radiotherapy?
The planning target volume (PTV) is a geometric concept, used for treatment planning, and it is defined to select appropriate beam sizes and beam arrangements, to ensure that the prescribed dose is actually delivered to the CTV.
What is clinical target volume?
The clinical target volume (CTV) is defined as the tissue volume that contains the gross tumor volume (GTV) and subclinical microscopic malignant lesions. Decades of experience led to the conclusion that 45–50 Gy results in high control rates for subclinical disease in patients with epithelial tumors (3-6).
What is the planning target volume?
The planning target volume (PTV) is the CTV plus a margin to allow for geometrical uncertainty in its shape and variations in its location relative to the radiation beams due to organ mobility, organ deformation, and patient setup variations.
What is the ICRU reference point?
The system of recommendations for reporting dose is based on the selection of a point within the PTV, which is referred to as the ICRU Reference Point. The ICRU Reference Point is selected firstly at the centre, or in the central part, of the PTV, and secondly on, or near, the central axes of the beams.
What is PTV CTV and GTV?
∎ Gross Tumor Volume (GTV) ∎ Clinical Target Volume (CTV) ∎ Planning Target Volume (PTV) ∎ Treated Volume.
What is IMRT used for?
Intensity-modulated radiation therapy (IMRT) is an advanced type of radiation therapy used to treat cancer and noncancerous tumors. IMRT uses advanced technology to manipulate photon and proton beams of radiation to conform to the shape of a tumor.
What is CTV and PTV?
Purpose: The radiotherapy planning target volume (PTV) encloses the clinical target volume (CTV) with anisotropic margins to account for possible uncertainties in beam alignment, patient positioning, organ motion, and organ deformation.
What Icru 62?
ICRU Report 62 provides recommendations on the volumes and absorbed doses that are important in prescribing, recording and reporting photon beam therapy, utilizing the new and improved irradiation techniques that have become available since the publication of ICRU Report 50 in 1993.
What is DVH in radiation therapy?
A plot of a cumulative dose-volume frequency distribution, commonly known as a dose-volume histogram (DVH), graphically summarizes the simulated radiation distribution within a volume of interest of a patient which would result from a proposed radiation treatment plan.
