8. Dorsal recumbency Longitudinal Plane- the transducer is in median
plane and indicator mark is towards cranial/head of the body
• We need to understand the orientation of ultrasound image in relation to the position of
transducer on the body. Suppose if I place transducer on the patient then what anatomic
orientation I expect to see on the screen.
• If you notice then every ultrasound transducer has an indicator/marking that may be dark or
kind of protrusion.
• Indicator mark appears usually on left side of screen.
• If we have patient on left and machine on right. And I place the transducer on the patient and I
point the indicator towards head cranially or superiorly then left of the screen is cranial.
• The position of indicator corresponds with the side of the screen, as indicator is towards cranial
or head or superior, it shows that cranial will appear on left side of screen.
9. Image interpretation median plane
• Dorsal recumbency Longitudinal Plane- the transducer is in median plane & indicator mark
is towards cranial/head of the body.
• The opposite side of indicator towards caudal of the body, the caudal will appear on right
side of screen.
• This corresponds the left and right of the screen. Now we discuss what the top or bottom of
the screen corresponds to, in the scenario when transducer mark is towards cranial.
• Consider the transducer as flash light, the beams are entering from ventral and exiting from
the dorsal.
• The near field and surface close to the transducer will be appeared as ventral & far field and
beam exiting from dorsal will appear on bottom of screen.
10. Lateral recumbency sagittal plane
• Lateral recumbency sagittal Plane- the transducer is right lateral/left lateral
recumbency & indicator mark is towards head/cranial of body.
• In this scenario, cranial of the organ or body appears on left of screen as
transducer mark is towards cranial, then caudal is at right and beam entering
from right side exiting from left, the right appears on the top and left at the
bottom of screen.
• The other scenario, cranial appears on the left, caudal on right, left on top and
right on bottom of screen.
11. IMAGE ORIENTATION AND LABELING FOR ABDOMINAL SCANNING
• Dorsal recumbency head oriented away from sonographer.
• In longitudinal plane: Cranial is oriented to sonographer left on the image.
• In transverse plane, the right side of animal is oriented to the left on the image.
• Transducer is placed on right or left lateral aspect of the abdomen in dorsal/lateral
recumbency, top viewed on monitor corresponds to animal’s right or left side
respectively.
13. DORSAL RECUMBENCY TRANSVERSE PLANE
• Displayed image from transverse view shows left on right, right side
on left & top viewed ventral.
when you’re scanning a patient in the transverse or axial plane, you’re
basically looking from the feet upwards - and again, keeping that indicator to
your left which will be the patient’s right.
• The image obtained from right lateral abdomen in transverse plane,
dorsal to left & ventral to right.
• Scan from left-lateral of abdomen in transverse plane, Ventral is on
left, dorsal on right.
