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DYNAMIC COMPUTED TOMOGRAPHY OF THE NORMAL FELINE HYPOPHYSIS CEREBRI ( GLANDULA PITUITARIA )
Author(s) -
Tyson Reid,
Graham John P.,
Bermingham Eden,
Randall Stacy,
Berry Clifford R.
Publication year - 2005
Publication title -
veterinary radiology and ultrasound
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.541
H-Index - 60
eISSN - 1740-8261
pISSN - 1058-8183
DOI - 10.1111/j.1740-8261.2005.00006.x
Subject(s) - cats , medicine , contrast medium , nuclear medicine , contrast enhancement , contrast (vision) , anatomy , radiology , magnetic resonance imaging , artificial intelligence , computer science
The purpose of this study was to describe normal feline hypophyseal mensuration and contrast enhancement characteristics using dynamic computed tomography (CT) imaging. An intravenous bolus of an ionic iodinated contrast medium was administered to eight cats using a pressure injector while dynamic CT images were obtained every 5 s for five cats and every 7 s for three cats for a total imaging time of 5 min. Each pituitary was measured at its maximum height and width on the peak contrast medium enhancement image. A hand‐drawn region of interest was placed around each hypophysis cerebri and time attenuation curves were generated. The specific enhancement pattern of the hypophysis cerebri for each cat was recorded. The mean width and height of the hypophysis cerebri was 5.2±0.4 (average±SD) mm and 3.1±0.3 mm, respectively. The mean time to maximum contrast enhancement was 28.6±14.8 s (range 14–50 s) from the onset of contrast medium injection. Four cats had initial dorsal and peripheral contrast enhancement patterns of the hypophysis cerebri, while four cats had an initial central contrast medium enhancement pattern. The hypophysis cerebri had a homogenous appearance in all cats, 28–50 s after contrast medium injection. The average (±SD) clearance half‐time was 292 (±87) s. Normal hypophysis cerebri mensuration and contrast medium enhancement characteristics will help in clinical evaluation of the feline hypophysis cerebri.