Showing catheter in brain

1. A medical tracking system, comprising:

a catheter configured to be inserted into, and moved around in, blood vessels of a body-part of a living subject, and comprising a flexible shaft having a deflectable distal end, and a location tracking transducer in the distal end, the location tracking transducer being configured to output a signal that is indicative of a location of the transducer in the body-part;

a tracking subsystem configured to track locations of the distal end of the catheter over time responsively to the signal;

a display; and

processing circuitry configured to:

add the tracked locations of the distal end to a movement log;

render to the display an image of at least part of the body-part of the living subject with a representation of a length of the shaft of the catheter in at least one blood vessel of the blood vessels of the body-part, with respective positions along the length of the shaft being located in the image responsively to respective ones of the tracked locations from the movement log;

define sides of a route traveled by the catheter based on at least a given radius around a line connecting the at least some tracked locations;

in response to the catheter being retracted in the at least one blood vessel with respect to at least one tracked location, remove the at least one tracked location from the movement log yielding an amended movement log; and

render to the display the representation of the length of the shaft according to the amended movement log.

2. The system according to claim 1 , wherein the processing circuitry is configured to render the length of the shaft so that the respective positions along the length of the shaft are located in the image responsively to the respective tracked locations according to a temporal order of the tracked locations in the movement log with one of the positions of the length of the shaft closest to a distal tip of the catheter corresponding with a most recent one of the tracked locations in the movement log.

3. The system according to claim 1 , wherein the processing circuitry is configured to confirm that the catheter has been retracted in the at least one blood vessel with respect to the at least one tracked location responsively to at least the distal end doubling back on the route defined by at least some of the tracked locations included in the movement log.

4. The system according to claim 3 , wherein the processing circuitry is configured to:

register a scanned image of at least part of the body-part delineating the blood vessels; and

compute locations of walls of the at least one blood vessel from data of the registered image.

5. The system according to claim 1 , wherein the catheter has a diameter of 1 mm or less.

6. The system according to claim 1 , wherein the tracking subsystem includes a location pad having at least one magnetic field radiator configured to transmit alternating magnetic fields into a region where the body-part is located, the location tracking transducer including a coil to detect at least part of the transmitted alternating magnetic fields.

7. The system according to claim 1 , the processing circuitry being further configured to determine whether the movement log is indicative of the catheter doubling back on itself.

8. The system according to claim 7 , the processing circuitry being further configured to, responsive to determining that the movement log is indicative of the catheter doubling back on itself, remove relevant tracked locations from the movement log.

9. A medical tracking method, comprising:

tracking locations of a deflectable distal end of a flexible shaft of a catheter configured to be inserted into, and moved around in, blood vessels of a body-part of a living subject over time responsively to a signal output by a location tracking transducer, the signal being indicative of a location of the location tracking transducer in the body-part;

adding the tracked locations of the distal end to a movement log;

rendering to a display an image of at least part of the body-part of the living subject with a representation of a length of the shaft of the catheter in at least one blood vessel of the body-part, with respective positions along the length of the shaft being located in the image responsively to respective ones of the tracked locations from the movement log;

defining sides of a route traveled by the catheter based on at least a given radius around a line connecting the at least some tracked locations; and

in response to the catheter being retracted in the at least one blood vessel with respect to at least one tracked location, removing the at least one tracked location from the movement log yielding an amended movement log; and

rendering to the display the representation of the length of the shaft according to the amended movement log.

10. The method according to claim 9 , wherein the rendering includes rendering the length of the shaft so that the respective positions along the length of the shaft are located in the image responsively to the respective tracked locations according to a temporal order of the tracked locations in the movement log with one of the positions of the length of the shaft closest to a distal tip of the catheter corresponding with a most recent one of the tracked locations in the movement log.

11. The method according to claim 9 , further comprising confirming that the catheter has been retracted in the at least one blood vessel with respect to the at least one tracked location responsively to at least the distal end doubling back on a route defined by at least some of the tracked locations included in the movement log.

12. The method according to claim 11 , further comprising:

registering a scanned image of at least part of the body-part delineating the blood vessels; and

computing locations of walls of the at least one blood vessel from data of the registered image.

13. The method according to claim 9 , wherein the catheter has a diameter of 1 mm or less.

14. The method according to claim 9 , further comprising:

transmitting alternating magnetic fields into a region where the body-part is located; and

detecting at least part of the transmitted alternating magnetic fields by a coil location tracking transducer comprised in the catheter.

15. A software product, comprising a non-transient computer-readable medium in which program instructions are stored, which instructions, when read by a central processing unit (CPU), cause the CPU to:

track locations of a deflectable distal end of a flexible shaft of a catheter configured to be inserted into, and moved around in, blood vessels of a body-part of a living subject over time responsively to a signal output by a location tracking transducer, the signal being indicative of a location of the location tracking transducer in the body-part;

add the tracked locations of the distal end to a movement log;

render to a display an image of at least part of the body-part of the living subject with a representation of a length of the shaft of the catheter in at least one blood vessel of the body-part, with respective positions along the length of the shaft being located in the image responsively to respective ones of the tracked locations from the movement log; and

define sides of a route traveled by the catheter based on at least a given radius around a line connecting the at least some tracked locations;

in response to the catheter being retracted in the at least one blood vessel with respect to at least one tracked location, remove the at least one tracked location from the movement log yielding an amended movement log; and

render to the display the representation of the length of the shaft according to the amended movement log.