System and method of generating contour structures using a dose volume histogram

A method of defining a new region of interest for an existing region of interest using a dose volume histogram, the method comprising using a computer to carry out the steps of:

• generating a dose volume histogram of radiation dose for a pre-existing region of interest;
• selecting a subset of the dose volume histogram;
• and
• defining a new region of interest that corresponds to the selected subset of the dose volume histogram,
• wherein the dose volume histogram is a dose volume histogram of a comparison between at least two dose volumes.

A method comprising using a computer to carry out the steps of:

• generating a first dose volume representing a first radiation dose for a patient;
• generating a second dose volume representing a second radiation dose for the patient;
• comparing the first dose volume and the second dose volume;
• generating a dose volume histogram based on the comparison;
• selecting a subset on the dose volume histogram;
• and
• generating a region of interest based on the selected subset.

A method of defining a new region of interest using a dose volume histogram, the method comprising using a computer to carry out the steps of:

• generating a first dose volume;
• generating a second dose volume;
• comparing the first dose volume and the second dose volume;
• generating a histogram based on the comparison;
• selecting a subset on the histogram;
• and
• generating a region of interest based on the selected subset.

A method of defining a new region of interest using a histogram, the method comprising using a computer to carry out the steps of:

• generating a histogram of radiation dose for a pre-existing region of interest;
• selecting a subset of the histogram;
• and
• defining a new region of interest that corresponds to the selected subset of the histogram.

A method of defining a new region of interest using a histogram, the method comprising using a computer to carry out the steps of:

• generating a histogram of radiation dose for a pre-existing region of interest;
• selecting a subset of the histogram;
• and
• defining a new region of interest that corresponds to the selected subset of the histogram, wherein the histogram is a dose volume histogram of a comparison between at least two dose volumes.