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WSV18-0036
NUTRITION AND DIAGNOSTIC IMAGING (LECTURES GIVEN IN MANDARIN CHINESE)
MEASUREMENT IN ULTRASONOGRAPHY: DOES IT MATTER?
H.G. Heng1
1Purdue University, Department of Veterinary Clincial Sciences, West Lafayette, USA
THE THORAX EXAMINED BY THE RADIOLOGIST: HOW TO AVOID MISTAKES
Hock Gan Heng, DVM, MVS, MS, DACVR, DECVDI
Purdue University, Department of Veterinary Clinical Sciences,
625 Harrison Street, West Lafayette, IN 47907, USA
hheng@purdue.edu
Two most commonly mistakes that can be avoid easily in reading thoracic radiographs occurs during the radiographic process, which are taking too few views and inappropriate positioning. Too few views
A minimum of 2 orthogonal views are needed for a thoracic study. A minimum of 3 views are needed for a metastatic check for metastatic neoplasia to the lungs. As aspiration pneumonia commonly occurs in the
right cranial and right middle lung lobes, a left lateral view is needed to diagnose this condition. A recent trend of performing 3 views (2 laterals and a VD) is recommended for all disease condition in thorax. A DV view is needed for the evaluation of the caudal lobar vessels in the investigation of cardiac disease. At our institute, we performed a DV, a VD and a lateral views for study of cardiology.
Inappropriate positioning
Shape and size of the cardiac silhouette is very sensitive to positioning. Any obliquity of the DV or VD views
will distort the cardiac silhouette and give us a wrong impression of cardiomegaly. Misdiagnosis of right cardiomegaly is commonly make with shifting of the cardiac silhouette to the right secondary to oblique positioning. The spine and the ribs are not optimize for reading. Wrong diagnosis of spinal fracture in cases of motor vehicle accident is common.
A designated person for quality control for all images taken is essential in any hospital. At our institute,
the radiology residents and radiologists approve all studies. Occasionally, patients need sedation or general anesthesia to achieve optimal positioning. Patient not suitable for sedation or general anesthesia may not have a good positioning radiograph and making reading difficult.
Your Singapore, the Tropical Garden City
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