Physics Test 2 - Digital Radiography and Flat Panel Detectors 💕

What do direct detectors use? What do they do?

• use a photoconductor (amorphous selenium)

• converts x-ray photons to electrical signal

What do indirect detectors use? What do they do?

• use a scintillator

• converts x-ray photons to light
  

Flat Panel Thin Film Transistors (TFTs)

• Used with both amorphous silicon (indirect) and amorphous selenium (direct) flat panel detectors

• TFTs collect electric charges as an array or matrix of pixel-size detector elements (DEL)
  

Digital Radiography Precautions

• COST $30,000- $80,000

• SUBJECT TO DAMAGE FROM ROUTINE USAGE

• SPECIAL CLEANSERS

• FLUID PROTECTION

• PATIENT WEIGHT

Extreme over exposure can cause

detector saturation and data drop

T/F with the wide dynamic range we can see clothing, bedding, bandages and positioning aides that we couldn’t see with CR

TRUE so take time to smooth surfaces and have the patient properly prepared

T/F Is it acceptable to annotate RT and LT markers?

NO, in a court of law that can be questioned