Index

Protein Data Bank exchange dictionary (pdbx) version 1.0521

_em_detector.detective_quantum_efficiency

Definition:

   The detective_quantum_efficiency (DQE)is defined as the 
     square of the signal-to-noise ratio in the recording device
     divided by the square of the signal-to-ratio in the electron beam:
    (SIGNAL/NOISE)2 recording device
   DQE =    -------------------------------
    (SIGNAL/NOISE)2 electron beam
   A DQE value of 1 indicates a perfect recorder. "DQE = 0.25" menas
   that the signal-to-noise ratio is reduced by half in the 
   recording step. 
        (0.5)**2  
  DQE = --------- = 0.25.
         (1.0)**2

Type: float

Mandatory item: no

Category: em_detector