Dec 1, 2013 · Using this software, we have determined the DQE curves of four direct electron detectors currently available: the Gatan K2 Summit, the FEI Falcon I and II, and the Direct Electron DE-12, under a variety of total dose and dose rate conditions.

The K2XP sensor offers a boost in performance of the K2 Summit camera across all spatial frequencies. Shown above is the DQE curve for the K2® Summit direct detection camera in super-resolution mode using the original K2 sensor and the new K2XP sensor.

The K2 Summit 4k x 4k direct detection camera is unique in its ability to count individual electrons, as opposed to the traditional integration of their analog signal. Specifically designed for electron counting, the K2 Summit has unprecedented sensitivity and Detective Quantum Efficiency (DQE), the most important measures by

Dec 1, 2014 · Three direct electron detectors offer better DQE than film at 300 keV. Recorded 300 keV electron events on the detectors have very similar Landau distributions. The Gatan K2 Summit detector has the highest DQE at low spatial frequency. The FEI Falcon II detector has the highest DQE beyond one half the Nyquist frequency.

May 5, 2013 · Determination of DQE. DQEs of the K2 Summit in both the linear and super-resolution–counting modes were measured by knife-edge images recorded at an acceleration voltage of 300 kV.

We find that all three detectors have a better DQE than film. The K2 Summit has the best DQE at low spatial frequencies but with increasing spatial frequency its DQE falls below that of the Falcon II.

Defined as the squared ratio of the output to input signal-to-noise ratio (S/N) 2 OUT /(S/N) 2 IN, DQE effectively quantifies how much noise and signal degradation occurs within the detector. An ideal detector would have a DQE of 1, indicating perfect efficiency with no added noise.

Feb 20, 2017 · The electron-counting mode of Gatan K2 camera demonstrates an unparalleled detective quantum efficiency (DQE) and enables HRTEM with ultra-low electron dose, making it possible to acquire HRTEM images of MOFs.

Comparison of DQE at 300 keV plotted against spatial frequency for various direct electron detectors, including the DE-20, Falcon II, and K2 Summit models. The DQE performance of traditional photographic film is also shown for reference.

Detector performance can be evaluated quantitatively using the detective quantum efficiency (DQE), which measures how much noise a detector adds to a recorded image.