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).

In all these reports, special attention was brought to introduce and define the concept of target volume and organ-at-risk [e.g., Gross Tumor Volume (GTV), Clinical Target Volume (CTV), Planning Target Volume (PTV), Organ at Risk (OAR)], which are being used throughout the world in daily radiotherapy practice. The implementation of these ...

The GTV may consist of primary tumour (GTV-T), metastatic lymphadenopathy (GTV-N), or other metastases (GTV-M). The GTV corresponds almost always to those parts of the malignant growth where the tumour cell density is the highest.

Is a tissue volume that contains a demonstrable GTV and/or subclinical malignant disease that must be eliminated. This volume must be treated adequately in order to achieve the aim of …

The gross tumor volume (GTV) is the gross demonstrable extent and location of the tumor. It may consist of primary tumor, metastatic lymphadenopathy, or other metastases. Delineation of GTV is possible if the tumor is visible, palpable, or demonstrable through imaging.

The concepts of Gross Tumor Volume (GTV), Clinical Target Volume (CTV), Planning Target Volume (PTV), Organs at Risk (OARs) and Planning Organ at Risk Volume (PRV) are recalled, or refined, and new examples are given to illustrate these concepts.

Jan 22, 2017 · It outlines volumes such as the gross tumor volume (GTV), clinical target volume (CTV), planning target volume (PTV), treated volume, and irradiated volume. It also discusses doses like the prescribed dose, maximum dose, and minimum dose.

What’s relevant in ICRU 83 ? Because delineation of a GTV may vary according to the diagnostic modality (e.g., clinical examination, anatomic imaging, functional imaging) used, a clear annotation is required. e.g. biological target volume (BTV), proliferative target volume (PTV), hypoxic target volume (HTV)...

Consistent with previous ICRU Reports 50 (ICRU, 1993), 62 (ICRU,1999) and 83 (ICRU, 2010), this report recommends a strict definition of target volumes [gross tumor volume (GTV) clinical target volume (CTV)] by reviewing imaging modalities used in clinical practice.

When contouring, the ICRU volume definition starts with creating a GTV followed by a CTV to account for uncertainties in microscopic tumor spread. The CTV is usually generated by first performing a margin expansion and then adjusting or cropping this …