Raymond Chieng

May 23, 2024 | radiopaedia.org | Laura Smith |Raymond Chieng

The lesser sac or omental bursa is a potential peritoneal space within the abdomen, part of the peritoneal cavity. The lesser sac may be conceptualized as the space posterior to the lesser omentum, between the posterior wall of the stomach and the surface of the peritoneum that covers the anterior surface of the left kidney 1. The epiploic foramen (of Winslow) is the only natural communication between greater and lesser sacs 3.

May 21, 2024 | radiopaedia.org | Yuranga Weerakkody |Raymond Chieng

Right-sided aortic arch is a type of aortic arch variant characterized by the aortic arch coursing to the right of the trachea. Different configurations can be found based on the supra-aortic branching patterns, with the two most common patterns being the right-sided aortic arch with mirror image branching and the right-sided aortic arch with aberrant left subclavian artery (ALSA). A right-sided aortic arch is thought to occur in approximately ~0.1% (range 0.05-0.2%) of the population.

May 8, 2024 | radiopaedia.org | Matt Morgan |Raymond Chieng

Strain elastography (also known as tissue strain elastography/static elastography/compression elastography) is a developing form of ultrasound that assesses tissues' macroscopic structure through the strain modulus. This is different from normal B-mode grayscale ultrasound which characterizes a tissue's elasticity but at a microscopic level. Strain elastography relies on Young's modulus to detect strain in the axial dimension.

Apr 25, 2024 | radiopaedia.org | Jeremy Jones |Raymond Chieng

The portal vein (PV) (sometimes referred to as the main or hepatic portal vein) is the main vessel in the portal venous system and drains blood from the gastrointestinal tract and spleen to the liver. A portal venous system connects two capillary beds, meaning one organ / organ system will drain blood into another organ / organ system, before returning to the heart.

Apr 23, 2024 | radiopaedia.org | Raymond Chieng

Iodine-123 (I123 or I-123) is a radioisotope of the element iodine (atomic number 53) used in nuclear medicine imaging including to scan the thyroid gland. Iodine-123 is produced in a cyclotron by bombarding Xenon-124 with a proton. Xenon-124 either will absorb the proton and loses a proton and a neutron to form Xenon-123, or Xenon-124 will absorb the proton and loses two neutrons to form Cesium-123. Cesium will later decay into Xenon-123 while Xenon-123 will decay in Iodine-123 1.