Proton Radiography & Tomography

Advancement Through Proton Imaging.

With a clinical treatment energy range of 70-250 MeV and the ability to accelerate protons up to 330 MeV, The Radiance 330® Proton Therapy System has the capability for proton radiography and tomography.

ProTom is developing a dual-purpose beamline, allowing for imaging and treatment with the same beam.

Proton Radiography and Tomography

Computed tomography (CT) scans and x- are currently used to map the size and shape of the tumor and to create a treatment plan. CT scans and x-rays use photons to create images.

Proton radiography and tomography is different as it uses protons to create images. The use of protons to create these images allows for reduced uncertainty and error associated relative stopping power, and eliminates the need to estimate relative biological effectiveness (RBE), resulting in improved treatment planning, verification, and treatment.

Additionally, proton radiography and tomography allows for faster positioning verification and reduced dose when imaging.1

Using proton radiography and tomography can also reduce uncertainty and increase accuracy. Using CT scans, the systematic error range is between 3% and 5% for soft tissue and is higher for harder structures and tissues.  Proton radiography and tomography could reduce range uncertainty to less than 1%.2


Proton Imaging is Not Currently Available for Commercial Sale


1 G Poludniowski, N M Allinson, P M Evans. “Proton radiography and tomography with application to proton therapy.” Br J Radiol. September 2015; 88(1053): 20150134. 

2  Elizabeth Allen.World-first Proton CT images create a new vision for cancer treatment.Phys.Org.
Published online 2017 May 11.