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Potential Imaging Artifacts - In-Line Digital (ILD)
NOTE 1: Length measurements are not representative of anatomy, since the computer
display will always represent the catheter pullback as a linear translation.
NOTE 2: Due to potentially significant inaccuracies, the user should carefully review
any computer generated boundary before proceeding with a measurement.
Contours
The imaging transducer at the
catheter tip may not always be
withdrawn from the artery in a
linear manner. Motion of the
catheter tip from side to side during
a pullback data collection will
appear on the sagittal view as if the
artery wall is moving towards and
away from the transducer axis.
None possible. Carefully review
the angiogram to determine the
vessel contours. Also, use the
outer vessel wall boundary (media
to adventitia interface) to evaluate
whether luminal irregularities are
due to catheter motion or actual
lumen variations. (Note that the
vessel wall boundary or the media
to adventitia interface changes
slowly as the catheter is moved
same image
plane presented
along artery
length
Due to the mechanical slack which
can occur in the pullback system,
the beginning of the pullback
sequence may contain a series of
images in which the image does not
change for several frames. This
occurs because the pullback device
is moving the catheter holder
clamp, and the system is collecting
data, but the transducer at the tip of
the catheter is not moving.
Ensure that there is no excessive
slack in the system. Observe the
image as the pullback is started. If
the image remains unchanged for
several images, use the
longitudinal editing feature to
remove the beginning of the
pullback sequence.
pullback rate–Z
axis
measurement
error
Operator entered the wrong
pullback rate when questioned by
the operating system.
None possible. This relies on the
operator correctly entering the
data. The pullback speed entered is
prominently displayed.
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General