Contrast Transfer Function. Accordingly the relationship between the object or and the image contrast ir can be written as ir or hr where stands for the convolution operation and. Ctf repeatedly crosses the k axis as k increases.
Ctf crosses the k axis and then. Accordingly the relationship between the object or and the image contrast ir can be written as ir or hr where stands for the convolution operation and. Ctf stays almost constant and close to 1 providing a broad band of good transmittance then.
Ctf crosses the k axis and then.
W 1 2 t w 1 2 t. Ctf repeatedly crosses the k axis as k increases. Ctf stays almost constant and close to 1 providing a broad band of good transmittance then. The phase contrast transfer function pctf in ctem is a function which modulates the amplitudes and phases of the electron diffraction pattern formed in the back focal plane of the objective lens and thus shows the phase shifts due to the combination of spherical aberration and defect of focus.