Learning objectives
To learn the abdominal anatomy that is required to abdominal ultrasonography.
Using virtual ultrasound images without artifacts created based on CT data,
understand the anatomy of upper abdominal organs,
especially the underlying organs such as pancreas,
which is difficult to identify the whole image with ultrasound.
To understand the running direction of the extrahepatic bile duct.
To understand the hepatic segment in each scanning method of ultrasound.
Background
Knowledge of abdominal anatomy is important and indispensable in performing abdominal ultrasonography.
However,
ultrasound may not be able to sufficiently observe organs due to artifacts due to gastrointestinal tract gas or deep attenuation of ultrasonic waves.
In addition,
although ultrasound is possible to freely obtain a scanning cross section,
it is often difficult to identify the hepatic segment in intercostal scan of the liver.
We have introduced a virtual ultrasound image simulation system using CT data for the purpose of understanding ultrasonic anatomy more deeply.
Findings and procedure details
Materials and Methods
Using adult abdominal CT data of 1 mm width,
each scan section similar to the ultrasonic examination and the movement of the probe on the body surface were recorded as animation on a 3D workstation( Fig. 1 ).
The data used were abdominal contrast cases and drip infusion cholangiography (DIC) CT cases.
DIC CT was used to identify the running direction of the extrahepatic bile duct.
Hepatic segmentation was color-coded,
in accordance with the portal vein branch.
The 3D workstations used are...
Conclusion
Abdominal ultrasonography is often difficult to observe sufficiently due to gastrointestinal tract gas,
deep attenuation of ultrasonic waves,
etc.
It is also difficult to understand and identify even the anatomy around the main organs.
An anatomical learning system using this simulation system is effective for enforcing more accurate abdominal ultrasound.
Personal information
Ryuzo Sekiguchi,
M.D.,
Ph.D.
Department of Radiology,Toho University Ohashi Medical Center
E-mail:
[email protected]
Masashi Nagamoto,
M.D.,
Ph.D.
Department of Radiology,Toho University Ohashi Medical Center
Tatsuya Gomi,
M.D.,
Ph.D.
Department of Radiology,Toho University Ohashi Medical Center
References
Bo WJ,
Carr JJ,
Krueger WA,
Wolfman NT,
Bowden RL.
Basic Atlas of Sectional Anatomy: With Correlated Imaging,
4th ed.
Saunders.
Philadelphia,
2007.
Takehara Y (ed.).
US screening (in Japanese).
Igakushoin,
Tokyo,
2008.
