| http://www.w3.org/ns/prov#value | - Alternately, the guidance of the needle 102, sleeve 104, and stylet 122, can be by external imaging, for example CT or MRI. It can also be by techniques, such as Fluoroscopy (as many materials for at least the needle 102, and sleeve 104 are radiopaque by their general nature, with other materials listed above for the needle 102 and sleeve 104 easily modified to be radiopaque).
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