Data Item _em_detector.detective_quantum_efficiency
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General 
- Item name
- _em_detector.detective_quantum_efficiency
- Category name
- em_detector
- Attribute name
- detective_quantum_efficiency
- Required in PDB entries
- no
- Used in current PDB entries
- No
Item Description
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
Item Example
0.25
Data Type 
- Data type code
- float
- Data type detail
- float item types are the subset of numbers that are the floating numbers.
- Primitive data type code
- numb
- Regular expression
- -?(([0-9]+)[.]?|([0-9]*[.][0-9]+))([(][0-9]+[)])?([eE][+-]?[0-9]+)?