What is radiation treatment volume?
The treated volume is, in general, larger than the planning target volume and depends on a particular treatment technique. Irradiated Volume: The volume of tissue receiving a significant dose (e.g., ≥50% of the specified target dose) is called the irradiated volume.
What does 6x mean in radiation therapy?
Dosimetric parameters for all the cases, comparing 6-MV (6x) with 18-MV (18x) treatment plans for large patients with prostate cancer, where denotes the rectum volume; denotes the bladder volume; denotes the normal tissue volume, CI denotes the conformai index, 6x denotes 6-MV photon beam, and 18x denotes 18-MV photon …
How much radiation treatment can a person have?
Typically, people have treatment sessions 5 times per week, Monday through Friday. This schedule usually continues for 3 to 9 weeks, depending on your personal treatment plan. This type of radiation therapy targets only the tumor. But it will affect some healthy tissue surrounding the tumor.
What is the 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).
Which cancers are treated with radiotherapy?
Types of Cancer that Are Treated with Radiation Therapy Brachytherapy is most often used to treat cancers of the head and neck, breast, cervix, prostate, and eye. A systemic radiation therapy called radioactive iodine, or I-131, is most often used to treat certain types of thyroid cancer.
How many times can a person take radiation?
In this type of brachytherapy, the radiation source is left in place for just 10 to 20 minutes at a time and then taken out. You may have treatment twice a day for two to five days or once a week for two to five weeks. The schedule depends on your type of cancer.
What is a gross tumor volume?
The gross tumor volume (GTV) is defined as the gross palpable or visible/demonstrable extent and location of malignant growth. From: PET-CT in Radiotherapy Treatment Planning, 2008.
What is clinical tumor volume?
The first of these two volumes is the position and extent of the primary tumour; this is known as the gross tumour volume (GTV). The second volume surrounds the GTV and describes the extent of microscopic, un-imageable tumour spread; this is known as the clinical target volume (CTV).