Webster's New World Medical Dictionary

radiologist, interventional
A radiologic sub-
specialist who uses fluoroscopy, computerized axial
tomography (CT), and ultrasound to guide wires
and catheters for performing procedures such as
biopsies, draining fluids, inserting catheters, and
dilating or stenting narrowed ducts or vessels. See
also 
radiology, interventional.
radiation therapy, external
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radiology
The medical specialty concerned with
radiation for the diagnosis and treatment of disease,
including both ionizing radiation such as X-rays and
nonionizing radiation such as ultrasound. Also known
as roentgenology.
radiology, interventional
The use of image
guidance methods to gain access to the deepest 
interior of most organs and organ systems.
Interventional radiology includes the use of bal-
loons, catheters, microcatheters, stents, therapeutic
embolization (deliberately clogging up a blood 
vessel), and more. The specialty of interventional
radiology overlaps with other surgical arenas,
including interventional cardiology, vascular sur-
gery, endoscopy, laparoscopy, and other minimally
invasive techniques, such as biopsies. Specialists
performing interventional radiology procedures
today include not only radiologists but also other
types of physicians, such as general surgeons, vas-
cular surgeons, cardiologists, gastroenterologists,
gynecologists, and urologists.
radiolucent
Permeable to one or another form
of radiation, such as X-rays. Radiolucent objects do
not block radiation but let it pass. Plastic is usually
radiolucent. The opposite of radiolucent is
radiopaque.