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Arcuate fasciculus tractography integrated into Gamma Knife surgery

Clinical article

Keisuke Maruyama Departments of Neurosurgery and

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M.D., Ph.D.
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Tomoyuki Koga Departments of Neurosurgery and

寻找其他论文Tomoyuki四郎
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M.D.
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Kyousuke Kamada Departments of Neurosurgery and

恭介Kamada寻找其他报纸
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Takahiro Ota Departments of Neurosurgery and

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Daisuke Itoh Radiology, The University of Tokyo Hospital, Tokyo, Japan

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M.D., Ph.D.
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Kenji Ino Radiology, The University of Tokyo Hospital, Tokyo, Japan

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R.T.
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Hiroshi Igaki Radiology, The University of Tokyo Hospital, Tokyo, Japan

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Shigeki Aoki Radiology, The University of Tokyo Hospital, Tokyo, Japan

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Yoshitaka Masutani Radiology, The University of Tokyo Hospital, Tokyo, Japan

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Ph.D.
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Masahiro Shin Departments of Neurosurgery and

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M.D., Ph.D.
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Nobuhito Saito Departments of Neurosurgery and

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Object

To prevent speech disturbances after Gamma Knife surgery (GKS), the authors integrated arcuate fasciculus (AF) tractography based on diffusion tensor (DT) MR imaging into treatment planning for GKS.

开云体育世界杯赔率

Arcuate fasciculus tractography was retrospectively integrated into planning that had been previously performed by neurosurgeons and radiation oncologists. This technique was retrospectively applied to 12 patients with arteriovenous malformations adjacent to the AF. Diffusion tensor images were acquired before the frame was affixed to the patient's head and DT tractography images of the AF were created using the authors' original software. The data from DT tractography and stereotactic 3D imaging studies obtained after frame fixation were transported to a treatment planning workstation for GKS and coregistered so that the delivered doses and incidence of posttreatment aphasia could be assessed.

Results

The AF could not be depicted in 2 patients who initially presented with motor aphasia caused by hemorrhaging from arteriovenous malformations. During the median follow-up period of 29 months after GKS, aphasia developed in 2 patients: 30 Gy delivered to the frontal portion of the AF caused conduction aphasia in 1 patient, and 9.6 Gy to the temporal portion led to motor aphasia in the other. Speech dysfunction was not observed after a maximum radiation dose of 10.0–16.8 Gy was delivered to the frontal fibers in 4 patients, and 3.6–5.2 Gy to the temporal fibers in 3.

Conclusions

The authors found that administration of a 10-Gy radiation dose during GKS was tolerated in the frontal but not the temporal fibers of the AF. The authors recommend confirmation of the dose by integration of AF tractography with GKS, especially in lesions located near the temporal language fibers.

Abbreviations used in this paper:

AF = arcuate fasciculus ; AVM = arteriovenous malformation ; DICOM = Digital Imaging and Communications in Medicine ; DT = diffusion tensor ; GKS = Gamma Knife surgery .
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