mA - It is no longer true that mAs controls image density, in FS where the same medium is used for detection and display the 2 are intimately linked. However in CR where detection and display are separate processes they are not linked. For a given CR image receptor mAS still determines the number of quanta that are absorbed and , therefore noise, the image processing controls the output signal and hence image density in CR.

kV - Kv still controls contrast BUT a linear response of CR (Exposure v density) means that matching the subject contrast to the Kv and film screen combination is much less important. The prime influence on contrast in CR comes from the "lookup tables" Kv along with tube filtration still controls the incident x-ray spectrum and therefore, subject contrast and scatter, image processing can partially compensate for loss of subject contrast.

This difference between Film Screen imaging and Computed radiography and the transition from FS to CR imaging is something radiographers find difficult and when  they produce a light or dark image are tempted to repeat the image using more or less exposure respectively in order to correct the image - this is the INCORRECT way to approach the problem, the method should be to check the Exposure index to see if enough exposure has been received by the imaging plate to permit image manipulation then check and adjust the image using the image processing functions of the system.

Scatter
As with FS systems scatter plays an important role - in fact scatter and its control is more important in CR than in FS radiography

CR Systems and Scatter
Here we compare the absorption spectra of FS screens (green line)  and CR image screens, (pink line) note the absorption peak (K edge) of CR screens to the considerably  lower due to the primary absorber Barium of CR compared with Gadolinium of FS screens,  hence the greater sensitivity to scattered radiation energies.

Now look at the primary and secondary or scatter spectra for a typicaly 80 Kv exposure, the scattered x-rays have lower energies than the primary beam, the storage phosphor CR absorbtion peak falls in the middle of the scattered engies range indicating that it will absorb a fair amount of these energies - compare this with the Lanex regular screen phosphor.
CR storage phosphor screens absorb more x-ray scatter than most conventional FS combinations under the same exposure conditions. This may explain observations that image quality of some images where there is a lot of scatter eg (Mediatinum in non grid chest images and the abdomen of large patients)  is lower with CR than conventional FS radiography.

Summary of Comparison of CR and FS phosphorus

Lookup table,
table allowing a display system to map pixel values into colours or grey scale values with a convenient range of brightness and contrast. Thus, a narrow range of input pixel intensities may be mapped onto the available range of output intensities. Rather than using the pixel values directly, the value is instead used as an address into a lookup table where the content of the table at that address defines the output  grey-scale value .