2D Fast Spoiled Gradient Echo (2D-FSPGR) Gd-DTPA Enhanced Dynamic MR Angiography in Cerebral Aneurysms after Treatment with Platinum Detachable Coils

Abstract

The purpose of this study is to evaluate the perfusional state of cerebral aneurysms treated by platinum detachable coils using three different techniques of MR angiography (MRA), and to compare the results of each MRA technique. Thirty examinations were investigated in twelve patients. They were three men and nine women, and their average age was 67y.o. They were all treated by platinum detachable coils for cerebral aneurysms. We obtained three different types of MRA on the same day; 2D-FSPGR Gd-DTPA enhanced dynamic MRA, 3D-TOF MRA with and without Gd-DTPA enhancement. On 2D FSPGR enhanced dynamic MRA, we used the first pass arterial phase for judgement that did not overlap the venous phase. In each study, we evaluated parent artery flow, branch artery flow, residual flow in coils, and residual neck. Digital subtraction angiography (DSA) was used as gold standard. On 3D-TOF MRA examinations without enhancement, parent artery flow was correctly identified with an accuracy of 96.7% with DSA confirmation. Branch artery flow was identified with an accuracy of 91.3%. Flow in the coils was correctly identified with an accuracy of 86.7%. Residual neck was correctly evaluated with an accuracy of 83.3%. On 3D-TOF MRA with enhancement, parent artery flow was correctly identified with an accuracy of 96.7%. Branch artery flow was identified with an accuracy of 91.3%. Flow in the coils was correctly identified with an accuracy of 93.3%. Residual neck was correctly identified with an accuracy of 86.7%. On 2D FSPGR enhanced dynamic MRA, parent artery flow was correctly identified with an accuracy of 100%. Branch artery flow was identified with an accuracy of 94.2%. Flow in the coils was correctly identified with an accuracy of 96.7%. Residual neck was correctly evaluated with an accuracy of 100%. Parent artery flow, branch artery flow, residual flow in coils, and residual necks were seen more accurately with 2D-FSPGR Gd-DTPA enhanced dynamic MRA than 3D-TOF MRA with and without enhancement. With T1 shortening effect of Gd-DT-PA and first pass arterial phase of 2D-FSPGR enhanced dynamic MRA techniques, we could evaluate more accurately the perfusional status of platinum-coil-treated cerebral aneurysms and arteries adjacent to the aneurysms than with non enhanced or enhanced 3D TOF MRA.