Which of the following statements about intravascular ultrasound (IVUS) is least accurate?

Intravascular ultrasound (IVUS) is a specialized imaging technique used to obtain detailed images of the inside of blood vessels. When considering the choices regarding the accuracy of the statements about IVUS, it is essential to understand how the technology operates.

The statement indicating that "the IVUS looks from the outside in" is least accurate because IVUS actually provides images that visualize from the inside out. This is accomplished by introducing a miniaturized ultrasound probe into the vascular lumen, which emits sound waves and receives the echoes reflected from the vessel walls and surrounding structures. This allows for real-time, cross-sectional imaging of the vessel interior, enabling evaluation of the arterial lumen, plaque characteristics, and vessel wall structure, rather than providing images from an external perspective.

In contrast, the other statements reflect accurate aspects of IVUS. The necessity of a hemostatic sheath during the introduction of the IVUS probe ensures that hemostasis is maintained while allowing safe access to the vascular system. Additionally, IVUS serves as an effective adjunct to conventional angiography by providing complementary information that can enhance the assessment of vascular conditions. Finally, IVUS is known for its ability to obtain precise luminal measurements, facilitating accurate evaluations of vessel dimensions and pathology.

Understanding these distinctions aids