Posted by geox 4 days ago
I'm constantly amazed at what these articles do not show. Like if we have an example of a foggy window image and one from CZT and now one from this new sensor, why not show an example of each? A picture is worth a 1,000 words after all, so not including them really does the reader a disservice when reading these articles.
"Record energy resolutions are achieved as 2.5% at 141 keV and 1.0% at 662 keV. Single photon imaging with single point and line 99mTc γ-ray sources showcases the high sensitivity of 0.13%~0.21% cps/Bq. Phantom imaging distinctly delineates individual column sources spaced 7 mm apart, indicative of an impressive spatial resolution of 3.2 mm. These findings lay the groundwork for integrating perovskite detectors into nuclear medicine γ-ray imaging systems, offering a balance of cost-effectiveness and superior performance."
Perovskite structures are interesting because they have unique material properties. The range of properties is quite broad: ferroelectric, pyroelectric, and piezoelectric properties, photoelasticity, very high permittivity, et cetera. In popular science news, you will mostly read about potential uses in solar cells, but they are already commonly used in our world: barium titanate is used as a dielectric in capacitors, lead zirconium titanate is used as the piezoelectric crystal in many resonators, lithium niobate is used for optical waveguides and for optical antialiasing filters because of its birefringence.
Images produced from SPECT cameras have been around for a while. [2]
This is potentially a 16 pixel "camera" which the "image" is a gaussian blob (Figure 1e and 5e) [1].
This is interesting for a variety of reasons but is way overblown in the "camera" or "image" context. It's demonstration that one can make pixelated devices (4x4) of a specific kind of promising material.
[1]https://www.nature.com/articles/s41467-025-63400-7
[2]https://en.wikipedia.org/wiki/Single-photon_emission_compute...
Roll-to-roll fabricated perovskite solar cells under ambient room conditions: https://news.ycombinator.com/item?id=39998740
IIRC it was some different type of imaging sensor, so looked it up that way