Role of 3D Display MR Angiography in the Study of Intracranial Aneurysms

Abstract

This paper determines the usefulness of three-dimensional (3D) phase-contrast (PC) magnetic resonance (MR) angiography with 3D display in characterizing large intracranial saccular aneurysms.

Eight patients referred for non invasive confirmation of unruptured aneurysm (n=9) detected by conventional CT and/or MR imaging were studied by 3D PC (VENC of 20 cm/s, 3 axes) in axial acquisition localised on the circle of Willis using a 0.5 T unit (Vectra, GE). We used 3D display images to assess the feasibility of selective treatment. Results were correlated with catheter angiograms in 3 patients.

In two thirds of the cases, location and size of the orifice, size of the sac, and clarification of parent artery were clearly provided allowing prediction of therapeutic management. In the remaining cases results remained doubful because of lack of spatial resolution. The benefit of the method was coupled with the clinical status of the patients to influence the final decision.

3D PC MR angiography with 3D display has emerged as an improvement in predicting therapeutic management, and is especially useful in large unruptured aneurysms in elderly or ill patients.

Keywords

angio-MR digital subtraction angiography subarachnoid hemorrhage

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References

Korogi

Takahashi

: Intracranial aneurysms: Diagnostic accuracy of three-dimensional, Fourier transform, time-of-flight MR angiography. Radiology 193: 181–186, 1994.

Huston

III Nichols

: Blinded prospective evaluation of sensitivity of MR angiography to known intracranial aneurysms: Importance of aneurysm size. Am J Neuroradiol 15: 1607–1614, 1994.

Bontozoglou

Spanos

: Three-dimensional display of the orifice of intracranial aneurysms: A new potential application for magnetic resonance angiography. Neuroradiology 36: 346–349, 1994.

Atlas

Listerud

: Intracranial aneurysms: Depiction on MR angiograms with a multifeature-extraction, ray-tracing postprocessing algorithm. Radiology 192: 129–139, 1994.

Schwartz

Tice

: Evaluation of cerebral aneurysms with helicoidal CT: Correlation with conventional angiography and MR angiography. Radiology 192: 717–722, 1994.

Vieco

Shuman

: Detection of circle of Willis aneurysms in patients with acute subarachnoid hemorrhage: A comparison of CT angiography and digital subtraction angiography. Am J Roentgenol 165: 425–430, 1995.

Huston

III Rufenacht

: Intracranial aneurysms and vascular malformations: Comparison of time-of-flight and phase-contrast MR angiography. Radiology 181: 721–730, 1991.

Araki

Kohmura

Tsukaguchi

: A pitfall in detection of intracranial unruptured aneurysms on three-dimensional phase-contrast MR angiography. Am J Neuroradiol 15: 1618–1623, 1994.