8 ms·

Pretty much. Normal x-ray sensors are like camera sensors and produce an estimate of total energy of the photons / pixel. Photon counting sensors are able to es

Pretty much. Normal x-ray sensors are like camera sensors and produce an estimate of total energy of the photons / pixel. Photon counting sensors are able to estimate how many photons of certain energy range hit the sensor. So instead of value ’1023’ you might get ’63’ of < 20kv, ’500’ of 20-50kv and ’50’ of > 50kv. So poor mans spectroscopy. Naive way to produce ’color images’ would be to put those buckets to red green and blue channel and now different materials along the beam path might yield equal values with normal x-ray sensors but slightly different colors with photon counting sensors. edit: clarified last sentence

Create 8y ago
The way "color images" are produced is to map the Hounsfield scale to the visible colour spectrum: i.e. blood red, bone white, steel gray etc. https://en.wikipedia.org/wiki/Hounsfield_units#Value_in_parts_of_the_body https://en.wikipedia.org/wiki/Hounsfield_units#Value_in_part... CT machines have this calibrated as standard, DICOM images have the corresponding fields for the values. Any DICOM viewer will do this (i.e. 3D Slicer, ParaView, OsiriX etc.) As you say, there is nothing new in this, just PR. Medipix also has been around for a while, it's basically a solid state detector with an integrated USB readout on the silicon. Neither has been invented at CERN, its COTS.
- lars_thomas 8y ago
  In this case it’s more than HU value LUT though. Photon counting allows per energy bin attenuation to capture more information. It’s cool and promising but costly and not new per se.
  - Create 8y ago
    Agreed. Photon counting has been around in (medical) imaging for ages.
- pharrington 8y ago
  To be more precise, CERN took part in Medipix3's development. https://medipix.web.cern.ch/medipix3-collaboration-members https://medipix.web.cern.ch/medipix3-collaboration-members Yes, this is a PR release for tech using the Medipix3. If I understand correctly (which I very probably don't since this HN thread is the first time I've heard of this technology), this is analogous to faster/more accurate AI software being developed with some chip company's latest massively parallel processor - representative of real, but nowhere near groundbreaking, technological advancement.

Create 8y ago

The way "color images" are produced is to map the Hounsfield scale to the visible colour spectrum: i.e. blood red, bone white, steel gray etc. https://en.wikipedia.org/wiki/Hounsfield_units#Value_in_parts_of_the_body https://en.wikipedia.org/wiki/Hounsfield_units#Value_in_part... CT machines have this calibrated as standard, DICOM images have the corresponding fields for the values. Any DICOM viewer will do this (i.e. 3D Slicer, ParaView, OsiriX etc.) As you say, there is nothing new in this, just PR. Medipix also has been around for a while, it's basically a solid state detector with an integrated USB readout on the silicon. Neither has been invented at CERN, its COTS.

lars_thomas 8y ago
In this case it’s more than HU value LUT though. Photon counting allows per energy bin attenuation to capture more information. It’s cool and promising but costly and not new per se.
- Create 8y ago
  Agreed. Photon counting has been around in (medical) imaging for ages.
pharrington 8y ago
To be more precise, CERN took part in Medipix3's development. https://medipix.web.cern.ch/medipix3-collaboration-members https://medipix.web.cern.ch/medipix3-collaboration-members Yes, this is a PR release for tech using the Medipix3. If I understand correctly (which I very probably don't since this HN thread is the first time I've heard of this technology), this is analogous to faster/more accurate AI software being developed with some chip company's latest massively parallel processor - representative of real, but nowhere near groundbreaking, technological advancement.