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Fixed A-P to P-A in coord systems docs #823

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Oct 7, 2019
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Fixed A-P to P-A in coord systems docs #823

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6 changes: 3 additions & 3 deletions doc/source/coordinate_systems.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -215,7 +215,7 @@ From scanner to subject

If the subject is lying in the usual position for a brain scan, face up
and head first in the scanner, then scanner-left/right is also the left-right
axis of the subject's head, scanner-floor/ceiling is the anterior-posterior
axis of the subject's head, scanner-floor/ceiling is the posterior-anterior
axis of the head and scanner-bore is the inferior-superior axis of the head.

Sometimes the subject is not lying in the standard position. For example, the
Expand All @@ -231,14 +231,14 @@ position of the subject. The most common subject-centered scanner coordinate
system in neuroimaging is called "scanner RAS" (right, anterior, superior).
Here the scanner axes are reordered and flipped so that the first axis is the
scanner axis that is closest to the left to right axis of the subject, the
second is the closest scanner axis to the anterior-posterior axis of the
second is the closest scanner axis to the posterior-anterior axis of the
subject, and the third is the closest scanner axis to the inferior-superior
axis of the subject. For example, if the subject was lying face to the right
in the scanner, then the first (X) axis of the reference system would be
scanner-floor/ceiling, but reversed so that positive values are towards the
floor. This axis goes from left to right in the subject, with positive values
to the right. The second (Y) axis would be scanner-left/right
(anterior-posterior in the subject), and the Z axis would be scanner-bore
(posterior-anterior in the subject), and the Z axis would be scanner-bore
(inferior-superior).

Naming reference spaces
Expand Down