A simple method of scalp localization using multiplanar reconstruction of MR images.
BACKGROUND
Image-based scalp localization methods currently used are complex and not standardized. The authors have developed a simple yet accurate method for craniotomy localization using multiplanar reconstruction (MPR) algorithms.


METHODS
In this method, the goal is to localize a projected point (defined as T) of the center of the lesion on the scalp. An oblique coronal plane is reformatted using a patient's magnetic resonance (MR) images with MPR algorithms to include both the center of the lesion and bilateral external auditory meati. Then the distance between T and the ipsilateral external auditory meatus or sagittal suture (defined as S) is measured along the scalp contour in the plane. The distance between the bregma and S is also measured. These distances are used for scalp localization, using a tape measure in the operating room.


RESULTS
We have had successful scalp localization in six clinical cases. It took about 3 min to measure each distance on the MR console.


CONCLUSIONS
This method for craniotomy planning using MPR algorithms is simple and sufficiently accurate.
Nakajima
S
S
Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts 02215, USA.
Atsumi
H
H
Metcalf
D C
DC
Yoshimine
T
T
Jolesz
F A
FA
Black
P M
PM
Kikinis
R
R
D003399:Craniotomy / Q000379:methods*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging