Doseless emission tomography attenuation correction

A system for correcting emission tomography images, comprising:

• a processor;
• a computer readable medium storing instructions for controlling the processor to perform steps comprising:
• reconstructing and creating a smoothed 3D volume using emission tomography data of a head of a patient;
• using said smoothed volume to define a boundary region estimating a position of a skull of the patient in the smoothed volume;
• and
• generating a map of attenuation coefficient values for the smoothed volume based on the boundary region,
• wherein the attenuation coefficient values within the boundary region are selected to correspond to an attenuation coefficient value for bone, and wherein the attenuation coefficient values for the portion of the image surrounded by the boundary region are selected to correspond to an attenuation value for tissue.

A non-transitory computer readable medium having stored thereon a plurality of instructions for performing a method of generating corrected emission tomography images, the method comprising:

• reconstructing and creating a 3D smoothed volume using emission tomography data of a head of a patient;
• using said smoothed volume to define a boundary region;
• and
• generating a map of attenuation coefficient values for the smoothed volume based on the boundary region,
• wherein the attenuation coefficient values within the boundary region are selected to correspond to an attenuation coefficient value for bone, and wherein the attenuation coefficient values for the portion of the image surrounded by the boundary region are selected to correspond to an attenuation value for tissue.