tissue-equivalent phantom

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• tissue-equivalent material — noun (radiology) Phantom material • • • Main Entry: ↑tissue …   Useful english dictionary

• phantom material — noun (radiology) Material producing absorption and backscatter of radiation similar to human tissue, hence used to study radiation doses, etc (also called tissue equivalent material) • • • Main Entry: ↑phantom …   Useful english dictionary

• Monitor unit — A monitor unit (MU) is a measure of machine output of a linear accelerator in radiation therapy. Linear accelerators are calibrated to give a particular absorbed dose under particular conditions. One standard calibration is such that 100 MU gives …   Wikipedia

• Matroshka experiments — The Matroshka (or Matroschka or Phantom) experiments on the International Space Station (ISS) use a mannequin that has been used to study cosmic radiation dose types and rates that relate to the health of space travellers on long duration… …   Wikipedia

• nervous system, human — ▪ anatomy Introduction       system that conducts stimuli from sensory receptors to the brain and spinal cord and that conducts impulses back to other parts of the body. As with other higher vertebrates, the human nervous system has two main… …   Universalium

• literature — /lit euhr euh cheuhr, choor , li treuh /, n. 1. writings in which expression and form, in connection with ideas of permanent and universal interest, are characteristic or essential features, as poetry, novels, history, biography, and essays. 2.… …   Universalium

• dose — 1. The quantity of a drug or other remedy to be taken or applied all at one time or in fractional amounts within a given period. Cf.:dosage (2). 2. In nuclear medicine, amount of energy absorbed per unit mass of irradiated material (absorbed d.) …   Medical dictionary

• tumor — 1. Any swelling or tumefaction. 2. SYN: neoplasm. 3. One of the four signs of inflammation (t., calor, dolor, rubor) enunciated by Celsus. [L. t., a swelling] acinar cell t. a …   Medical dictionary

• environment — environmental, adj. environmentally, adv. /en vuy reuhn meuhnt, vuy euhrn /, n. 1. the aggregate of surrounding things, conditions, or influences; surroundings; milieu. 2. Ecol. the air, water, minerals, organisms, and all other external factors… …   Universalium

• List of Doctor Who universe creatures and aliens — This is a list of fictional creatures and aliens from the universe of the long running BBC science fiction television series Doctor Who, including Torchwood, The Sarah Jane Adventures and K 9. It covers alien races and other fictional creatures,… …   Wikipedia

• Calcitonin — is a 32 amino acid linear polypeptide hormone that is produced in humans primarily by the parafollicular cells (also known as C cells) of the thyroid, and in many other animals in the ultimobranchial body.[1] It acts to reduce blood calcium… …   Wikipedia