Digital atlas of fetal brain MRI.
BACKGROUND
Fetal MRI can be performed in the second and third trimesters. During this time, the fetal brain undergoes profound structural changes. Interpretation of appropriate development might require comparison with normal age-based models. Consultation of a hard-copy atlas is limited by the inability to compare multiple ages simultaneously.


OBJECTIVE
To provide images of normal fetal brains from weeks 18 through 37 in a digital format that can be reviewed interactively. This will facilitate recognition of abnormal brain development.


METHODS
T2-W images for the atlas were obtained from fetal MR studies of normal brains scanned for other indications from 2005 to 2007. Images were oriented in standard axial, coronal and sagittal projections, with laterality established by situs. Gestational age was determined by last menstrual period, earliest US measurements and sonogram performed on the same day as the MR. The software program used for viewing the atlas, written in C#, permits linked scrolling and resizing the images. Simultaneous comparison of varying gestational ages is permissible.


RESULTS
Fetal brain images across gestational ages 18 to 37 weeks are provided as an interactive digital atlas and are available for free download from http://radiology.seattlechildrens.org/teaching/fetal_brain .


CONCLUSIONS
Improved interpretation of fetal brain abnormalities can be facilitated by the use of digital atlas cataloging of the normal changes throughout fetal development. Here we provide a description of the atlas and a discussion of normal fetal brain development.
Chapman
Teresa
T
Seattle Children's Hospital, Department of Radiology, MS R-5417, 4800 Sand Point Way NE, Seattle, WA 98105, USA. Teresa.chapman@seattlechildrens.org
Matesan
Manuela
M
Weinberger
Ed
E
Bulas
Dorothy I
DI
D001921:Brain / Q000033:anatomy & histology* / Q000196:embryology*; D003198:Computer Simulation; D005865:Gestational Age; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods; D008953:Models, Anatomic; D011873:Radiology Information Systems