Data Item _em_detector.detective_quantum_efficiency

General

Item name
_em_detector.detective_quantum_efficiency
Category name
em_detector
Attribute name
detective_quantum_efficiency
Required in PDB entries
no
Used in currrent 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]+)?