Have an account? Please log in.
Text size: Small font Default font Larger font
Radiology Daily
Radiology Daily PracticalReviews.com Radiology Daily
  • Comments

This is so weird: a common engine lubricant can also “lubricate” the speed of digital X-ray detectors in imaging devices, making them respond 10 times faster than current detectors.

Many large imaging devices use amorphous silicon in their photodetectors. It absorbs light (and X-rays) well and is relatively inexpensive to process. But it has structural defects that prevent the fast, ordered movement of electrons. So it can be slow to sense X-rays, and it’s subject to image retention (image lag).

Engineers at the University of California, Berkeley, combined a sheet of amorphous silicon with a thin sheet of molybdenum disulfide (MoS2), a silvery black inorganic compound that’s used as a dry lubricant for everything from auto, motorcycle, and airplane engines to bicycle coaster brakes and ski waxes. The combination created a diode with a photoresponse rate 10 times faster than that of amorphous silicon alone.

Sayeef Salahuddin, PhD, an assistant professor of electrical engineering and computer sciences at UC Berkeley, said:

Our discovery could bring transformational changes in applications from biomedical imaging to solar cells to energy-efficient transistors.

Dr. Salahuddin was quoted in a UC Berkeley news release. He and research scholar Mohammad Esmaeili-Rad, PhD, created the new detector. They published an article about their findings online Friday in the open-access journal Scientific Reports.

Drs. Salahuddin and Esmaeili-Rad suggest that the new material would be ideal for high-speed applications such as fluoroscopy and tomography. And, they write, “The fast response also allows shorter X-ray exposure times to patients, which helps to reduce the health hazards of X-ray radiation.”

MoS2 is easy and inexpensive to handle. It consists of nanosheets that can be torn off like pages in a book. In fact, flakes are commonly removed from MoS2 crystals by peeling them off with common transparent adhesive tape. Again, weird. But true.

* * *

Exposure of male health workers to routine on-the-job radiation may damage sperm. For details, see our Facebook page.

Related CME seminar (up to 25.25 AMA PRA Category 1 credits™): UCSF Interventional Radiology Review


Permalink: http://www.radiologydaily.com/?p=11438


  • No Related Posts
  • Comments

Would you like to keep current with radiological news and information?

Post Your Comments and Responses

Comments are closed.