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patient Scintillating crystals connected to photomultipli er tubes Positron from FDG and an electron combine to create two 511keV photons Crystals create a flash of light when 511keV photons hit The light flash is converted to an electrical signal in the photomultiplie r tubes If the signals arrive within nano seconds they are accepted to create the image. This process is called ‘electronic collimation’ and is what makes PET so sensitive The signal is amplified in the photomultiplier tubes Much more signal amplification takes place in the photomultiplie r tubes coincide nce The 2 signals from the photomultiplier tubes are fed into circuitry that defines the time difference between signals Pet scanners consist of rings of detectors, composed of photomultiplier tubes connected to scintillating crystals, that circle the patient. Here we see 2 such opposing detectors in one ring.

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Positron from FDG and an electron combine to create two 511keV photons. If the signals arrive within nano seconds they are accepted to create the image. This process is called ‘electronic collimation’ and is what makes PET so sensitive. - PowerPoint PPT Presentation

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Page 1: patient

patient

Scintillating crystals connected to photomultiplier

tubes

Positron from FDG and an

electron combine to create two

511keV photonsCrystals create a

flash of light when 511keV photons hit

The light flash is converted to an

electrical signal in the photomultiplier

tubes

If the signals arrive within nano seconds they are accepted to

create the image. This process is called

‘electronic collimation’ and is what makes PET

so sensitive

The signal is amplified in the photomultiplier

tubes

Much more signal amplification takes

place in the photomultiplier

tubes

coincidence

The 2 signals from the photomultiplier tubes are

fed into circuitry that defines the time

difference between signals

Pet scanners consist of rings of detectors, composed of

photomultiplier tubes connected to scintillating crystals, that circle the

patient. Here we see 2 such opposing detectors in one

ring.

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