RESNA 26th International Annual Confence
The key components of the system hardware are a Pentium-based
PC, minimum of 64 MB RAM, a velocity sensor, a direction sensor,
DAC card, HMD and a PC joystick port as shown in Figure 1.
Technically PC-based rRAH system converts bicycle to an ultimate
2-axis, 2-button joystick. A D-sub type 15-pin connector on
the game port serves as the interface between the bicycle and
the PC. The outputs of the velocity and the direction sensor
from the bicycle serve as system inputs to the joystick port.
Another set of system inputs is the physiologic data collected
from the sensors attached to the patient and fed to the data
acquisition card. The output of the velocity sensor will also
be fed to the data acquisition card for exercise performance
data measurements. The prototype architecture is shown in Figure
1.
The system outputs visualized on the HMD will be the virtual
environment and the graphic user interface displaying the physiologic
and exercise performance data. This user-centered data can be
transmitted via TCP/IP to the clinician for remote consultation.