The loss of some of those pixels has no impact on the perceived quality of the image nor does it significantly change reader-interpretive performance. However, the answer is not simple. Image-transmission time is directly proportional to the file size of the digital image. A radiological image contains a large amount of digital information. For example, an image with a relatively low resolution of 512 x 512 x 8 bits contains 2,097,152 bits of data, and a 1,024 x 1,024 x 8-bit image has 8,388,608 bits of data.
Transmission time has to follow the laws of size.
Seconds to Transmit. For modem control, all modems add 2 bits when transmitting. Modem protocol overhead, turnaround time, and typical phone line interference cause all modems to be slower than their published capacity, usually by a factor of 20 to 30 percent. If the disruption exceeds a modem-determined threshold, the modem will reduce its speed. The amount that a modem slows down is called a fall-back rate.