System and method for controlling power consumption of an in vivo device
A method and device may control energy consumption of in an in vivo imaging device by determining or estimating an amount of energy needed to capture images at a frame rate until a complete passage of the device through a predetermined region of the gastrointestinal tract, and alter or limit the frame capture rate accordingly.
1. A method for controlling energy consumption of an in vivo imaging device, the method comprising:
repeatedly calculating a minimal amount of energy needed to operate the in vivo imaging device at a minimum non-zero frame capture rate to complete a passage of the device through at least a predetermined region of the GI tract;
calculating the amount of available energy remaining in the device power supply, based on an amount of energy associated with capturing a frame and the number of frames captured;
when the amount of available energy remaining in the device power supply is greater than the minimal amount of energy, enabling operation of the device at a frame capture rate above the minimum non-zero frame capture rate;
and
when the available energy remaining in the device power supply is not greater than the minimal amount of energy, operating the device at the minimum non-zero frame capture rate.
2. The method of claim 1 , wherein the capture rate above the minimum non-zero frame capture rate is determined based on at least one of the elements from the group consisting of: degree of similarity between sequential captured frames, detection of pathologies in frames, device speed or a degree of acceleration and/or rotation motion, color, hue, saturation, texture or patterns in images or between sequential images, impedance variation, and pH.
3. The method of claim 1 , wherein the capture rate above the minimum non-zero frame capture rate is at least partially determined based on the anatomical region of the body where the device is located.
4. The method of claim 1 , wherein the difference between an initial useable energy held in a power source of the device and an accumulated amount of energy used during device operation never exceeds the amount of energy needed to continue capturing image frames until the complete passage of the device in a region of interest.
5. The method of claim 1 , comprising, determining an approximation of the cumulative amount of energy used during the operation of the device based on averages of energies used by an illumination source, imager, processor, and transmitter and wherein the available energy remaining in the device power supply is calculated to be the difference between an initial available energy and the approximated cumulative energy used.
6. The method of claim 1 , wherein the capture rate above the minimum non-zero frame capture rate is relatively higher when the device is located in a predefined region of interest than in any other region of the GI tract.
7. The method of claim 1 , wherein the capture rate above the minimum non-zero frame capture rate is relatively lower when the device is located in the small bowel compared to when the device is located in the colon.
8. The method of claim 1 , wherein the capture rate above the minimum non-zero frame capture rate is relatively lower when the device is located in the stomach as compared to when the device is located in the colon or the small bowel.
9. The method of claim 1 , comprising, when the device passes from the stomach to the small bowel, increasing the capture rate above the minimum non-zero frame capture rate from a first frame rate to a second frame rate.
10. The method of claim 9 , comprising, when the device passes from the small bowel to the colon, increasing the capture rate above the minimum non-zero frame capture rate from the second frame rate to a third frame rate.
11. The method of claim 1 , comprising determining a maximum duration of the complete passage of the device through the predetermined region of the GI tract to be imaged.