According to the paper entitled "Recursive tracking of vascular networks in angiograms based on the detection-deletion scheme" (IEEE Trans. Med. Imaging 12: 334-341, 1993), what is the purpose of deleting a vessel segment from the image immediately after it is detected?
(A) to conserve the usage of memory,
(B) to graphically show the process of tracking every vessel,
(C) to improve the speed of the tracking algorithm,
(D) to prevent re-entry of the tracking path,
(E) none of the above.