Abdominal aortic aneurysm (AAA) can be defined as an abnormal, progressive dilatation of the abdominal aorta, carrying a substantial risk for fatal aneurysmal rupture. Endovascular aneurysmal repair (EVAR) for AAA is a minimally invasive endovascular procedure that involves the placement of a bifurcated or tubular stent-graft over the AAA to exclude the aneurysm from arterial circulation. In contrast to open surgical repair, EVAR only requires a stab incision, shorter procedure time, and early recovery. Although EVAR seems to be an attractive solution with many advantages for AAA repair, there are detailed requirements and many important aspects should be understood before the procedure. In this comprehensive review, fundamental information regarding AAA and EVAR is presented.

Park JW, et al. Korean J Radiol. 2021 Jan;22(1):139-154. https://doi.org/10.3348/kjr.2019.0897

Cho Y, et al. Korean J Radiol. 2023 Jun;24:e35. https://doi.org/10.3348/kjr.2023.0385

Transarterial chemoembolization (TACE) was introduced in 1977 with the administration of chemotherapeutic agent to gelatin sponge particles through the hepatic artery in patients with hepatocellular carcinoma (HCC) and was established as conventional TACE using Lipiodol in the 1980s. In the 2000s, drug-eluting beads were developed and applied clinically. Currently, TACE is a commonly used non-surgical treatment modality for patients with HCC who are unsuitable for curative treatment. Considering the vital role of TACE in the management of HCC, it is crucial to organize current knowledge and expert opinions regarding patient preparation, procedural techniques, and post-treatment care in TACE, which can enhance therapeutic efficacy and safety. A group of 12 experts in the fields of interventional radiology and hepatology, convened by the Research Committee of the Korean Liver Cancer Association (KLCA), has developed expert consensus-based practical recommendations in TACE. These recommendations have been endorsed by the Korean Society of Interventional Radiology and provide useful information and direction in performing TACE procedure as well as pre- and post- procedural patient care.

The interlayer coupling strengths associated with different oscillation periods in Co/Cu/Co sandwiches for different orientations are calculated based on the spin asymmetry of the reflection amplitude at extremal points. A realistic tight-binding model which includes s, ${\mathit{p}}^3$, and ${\mathit{d}}^5$ orbitals is adopted to calculate the reflection amplitudes. At the interface, all evanescent states are included to meet proper boundary conditions. The spin asymmetry of the reflection amplitude which is the crucial factor for determining the coupling strength is found to depend on the details of the band structures. Unique features are found when there are more than one reflected waves, which do not exist in the single-band model. For certain periods inferred from the spacer Fermi surface, the coupling strengths are found too small to be detected.