The ornamental design for digital radiography cassette, as shown and described.
FIG. 1 is a rear elevational view of digital radiography cassette, showing my new design;
FIG. 2 is a front elevational view thereo;
FIG. 3 is a top side perspective view thereof;
FIG. 4 is a left side perspective view thereof;
FIG. 5 is a right side perspective view thereof;
FIG. 6 is a bottom side view thereof; and,
FIG. 7 is a top plan view thereof.
The broken lines in the drawings are included for the purpose of illustrating portions of the digital radiography cassette that form no part of the claimed design.