Imaging Modalities of Urinary System (V) MRI ·1、 Scanning techniques and methods (1 respiratory gating and respiratory compensation (2)imaging sequences: SE, FSE, T1WI and T2WI of GRE, enhanced T1WI, fat suppression techniques (3) scan range, scan time and the period of enhanced phase(similar as CT
（Ⅴ）MRI • 1、 Scanning techniques and methods: (1) respiratory gating and respiratory compensation (2) imaging sequences: SE, FSE, T1WI and T2WI of GRE, enhanced T1WI, fat suppression techniques (3) scan range, scan time and the period of enhanced phase (similar as CT) Imaging Modalities of Urinary System
Imaging Modalities of Urinary System (V)MRI 2 Non-enhanced MRI: to determine the histological characteristics of lesions(fat, hemorrhage calcification, etc.) 3 Enhanced mri: its value is similar to ct 4、 Special methods (1) renal artery MRA: CE MRA with contrast agents (2)MRU: heavy T2W imaging for the examination of urinary tract obstruction
（Ⅴ）MRI 2、Non-enhanced MRI: to determine the histological characteristics of lesions (fat, hemorrhage, calcification, etc.). 3、Enhanced MRI：its value is similar to CT 4、Special methods： （1）renal artery MRA: CE MRA with contrast agents (2）MRU： heavy T2W imaging for the examination of urinary tract obstruction Imaging Modalities of Urinary System
Normal Imaging Findings
Normal Imaging Findings
(I) Normal X-Ray Findings Kidney Ureters Bladder
（Ⅰ） Normal X-Ray Findings • Kidney： • Ureters： • Bladder：
1 Kidney KUB shows kidney shadows due to perirenal fat 1)Bean-shaped, central of inner edge slightly concave, outer edge smooth 2)“八”- shaped located on both sides of spine, the right kidney is slightly lower, the long axis of the kidney out from the inside top of the ramp below Renal ridge angle 1525 (3) Height 1213cm, width 56cm (4) Homogeneous density, move with respiration But excursion may be less than 1 vertebral body height when from supine to standing position
1、Kidney：KUB shows kidney shadows due to perirenal fat. （1）Bean-shaped, central of inner edge slightly concave, outer edge smooth. （2）“八”-shaped located on both sides of spine, the right kidney is slightly lower, the long axis of the kidney out from the inside top of the ramp below. Renal ridge angle 15 ~ 25 °. （3）Height 12~13cm, width 5~6cm. （4） Homogeneous density, move with respiration. But excursion may be less than 1 vertebral body height when from supine to standing position