Cone-beam CT quick renewal can speed up diagnosis and treatment, lower dose

In the United States medical physicists annual meeting (AAPM), an author of the study showed that a new type of cone-beam CT Imaging method that can be used in image-guided radiation therapy (IGRT) before pouring CT, significantly impede the patient to radiation exposure.

Cone-beam CT in IGRT treatment plays an important role in the diagnosis and treatment means you can duplicate scanning when radiotherapy, precisely positioning adjacent tissue tumor, radiation exposure is reduced to a minimum.

But duplicate scanning produces a large dose of radiation is a very big ones.

Reduce the total number of x-ray scanning, as well as current strength is a simple way to reduce the dose, but the resulting image noise, data processing is slow.

University of California at San Diego's Dr. Jia Xun (Xun Jia) in this society statement on that for radiation therapy, the rapid reconstruction is a must.

These new CT reconstruction algorithm draws on video with the image processing software (GPU) compressed sensing technology.

Use the GPU technology can rebuild in 2 minutes cone-beam CT scan images.

Researchers have developed a fast GPU-based algorithm for the reconstruction of the high quality image cone-beam CT, these images come from the noisy and sampling standards following the diagnosis and treatment of data, in order to reduce the radiation noise.

20-40-x-ray diagnosis and adequate for image reconstruction, the image quality is sufficient for image-guided radiation therapy.

Renewal time from 77 seconds to 130 seconds, using Nvidia Tesla C1060 is GPU card, according to the acquisition of CT vary rows than similar iterative reconstruction method for fast by 100 times.

"Our algorithms like cone-beam CT Imaging can as a case of low-speed 0.1mAs/level. "The researchers said. And now the usual 360 CT comparison, this approach can reduce the dose to one of 36 to 72 points.

"Our algorithms to limit exposure field of cone-beam CT image reconstruction can further reduce the dose limit angle scanning, you can shorten scan time.

"If used for diagnostic imaging, this method can be one-tenth the dose lowered CT or more. Dr. Jiang joint authors.