Dosimetry monitoring

Scintillating fiber dosimeter for radiology

Scintillating fiber dosimeter for radiology.

The challenge
Quantify the level of radioactive exposure received by a patient during a radiological examination (CT or IRM scan).

Major constraints

  • extreme and confined environments with X-rays and Gamma-rays
  • robustness to support the patient’s weight
  • real time mapping with ultra-compact invisible devices
  • very low bending radius with scintillating optical fibers

SEDI-ATI solution
The dosimeter for radiology integrates a radiation probe consisting in a 500 µm scintillating fiber spliced on both ends to 500 µm plastic fibers, and placed beneath or even inside the patient’s mattress.

Advantages of the SEDI-ATI solution
Opacity of the protection coating of the optical fibers against parasitic emissions (ambient light, neon light…).

Scintillating fiber dosimeter for radiology

SEDI-ATI designs scintillating fiber optic probes for dosimeter applications applied to radiology.

X-rays are nowadays essential in the characterization and metrology of materials, objects and living species, as well as in certain therapies such as cancer therapy for example. One of today’s societal challenges is the quantification of the level of radioactive exposure of the patient during a radiological examination such as a CT or MRI scan.

The idea is to place an ultra-compact and flexible X-ray detector either under or inside the mattress, or even in the headrest, of the examination table where the patient stands.

A first solution under study is a fiber probe, consisting of a 500 µm plastic optical fiber and a 500 µm scintillating X-ray sensitive fiber optic section.

A second solution under study is a woven mesh of scintillating optical fibers, which could in addition make it possible to very finely locate the position where the radiation was received.

SEDI-ATI has a long experience on splicing scintillating optical fibers with plastic optical fibers on both ends to perform a radiation probe. The splicing between the two fiber types, having a similar 500 µm diameter, is not feasible by fusion but needs to be done by a mechanical process protected thanks to a stainless tube.

Thanks to its notoriety on scintillating fibers, SEDI-ATI is also the industrial partner of the ANR project called NANOPTIX. The research project aims to develop the next generation of miniaturized X-ray sensors with faster response time, higher sensitivity and crosstalk free.

This project targets tiny X-ray probes integrated at the end of narrow fibers of the size of a human hair. To this end, NANOPTIX will exploit, for the first time, the concept of Nano-Optical Antenna (NOA) for controlling the X-ray excited luminescence (XEL) from scintillators.