Scintigraphy of the spinal canal and subarachnoidal space after lumbar injection of 111In-DTPA.
Today replaced by spine CT.

Omnipaque is a low-osmolar, nonionic, contrast medium with a broad range of indications, for example intravascular diagnostic procedures such as coronary angiography, spinal cord imaging, and body cavity procedures including shoulder and knee joints. Omnipaque is approved for use in adults and children, and is available in a wide variety of packagings.

See also Nonionic Contrast Agents.

Planck is a MKS unit of energy (expended over time to angular momentum, etc.). One Planck unit is equal to 1 joule second (J x s) or about 0.7375 foot pound second (ft x lb x s). Atomic nuclei possess an intrinsic angular momentum referred to as spin, measured in multiples of Planck's constant. The unit is named for the German physicist Max Planck.

A positron is a positively charged, with a resting energy of at least 511 keV, subatomic particle. A positron is the antiparticle of an electron, identical in mass and spin.
Positrons can be generated by positron decay or pair production.
Positron emission tomography detects positrons from the decay of radioactive tracers.

See also Beta Decay.

A proton is a basic particle located in the nucleus of an atom. The number of protons in the nucleus governs the chemical properties of that element. The positive electrical charge is equal to the negative charge of an electron and the mass is similar to that of a neutron (see also baryon). The proton belongs to the group of hadrons and is composed out of three quarks.
A hydrogen (H1) nucleus is build of one proton.
Proton beam therapy is the preferred treatment for cancers near the eye and the spinal cord.