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This is traditionally done by injecting a radio-opaque contrast agent into the blood vessel and imaging using X-ray based techniques such as fluoroscopy.— Recently Uploaded Slideshows
Since barium is radio-opaque, it can sketch the colon in the X-ray, thus helping in the diagnosis of ulcerative colitis.
(radio-opaque markers) Contrast ◦ Esophagus ◦ Rectum ◦ Bladder ◦ Stomach— Recently Uploaded Slideshows
To protect against skimming and eavesdropping attacks, federal and state officials recommend that Americans keep their e-passports tightly shut and store their RFID-tagged passport cards and enhanced driver's licenses in "radio-opaque" sleeves.— Gaea Times (by Simple Thoughts) Breaking News and incisive views 24/7
government, is to purchase a "radio-opaque" sleeve for storing your passport.

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