screen (redirected from Bjerrum screen)

screen (skrēn)

1. a structure resembling a curtain or partition, used as a protection or shield, e.g., against excessive radiation exposure.

2. a large flat surface upon which light rays are projected.

3. protective (2).

4. to examine by fluoroscopy (Great Britain).

5. to separate well individuals in a population from those with an undiagnosed pathologic condition by means of tests, examinations, or other procedures.

---

skin screen  a substance applied to the skin to protect it from the sun's rays or other noxious agents.

solar screen , sun screen sunscreen.

---

screen (skrn)

n.

1. One that serves to protect, conceal, or divide.

2. The white or silver surface on which a picture is projected for viewing.

3. A screen memory.

v.

1. To process a group of people in order to select or separate certain individuals from it.

2. To test or examine for the presence of disease or infection.

---

screen [skrēn]

1. a framework or agent used as a shield or protector; called also protectant and protective.

2. to separate well individuals in a population from those who have an undiagnosed disease, defect, or other pathologic condition or who are at high risk by means of tests, examinations, or other procedures. See also screening.

Bjerrum screen tangent screen.

fluoroscopic screen a phosphorescent screen that shows the movement and relationship of organs and structures in fluoroscopy.

intensifying screen a fluorescent screen used in conjunction with x-ray film to enhance the effect of the radiation and reduce dosage to the patient. The screen must be matched to the emissivity range; the emissivity of phosphorus is similar to that of the human eye, so that phosphors absorb x-ray energy and convert it to visible light.

tangent screen a large square of black cloth with a central mark for fixation; used with a campimeter in mapping the field of vision.

---

screen,

n initial examination to determine the existence of a disease or disorder.

---

screen

1. a framework or agent used as a shield or protector.

2. to examine.

---

fast screen

permits big reduction in exposure to x-ray beam.

screen film

prepared to be used with intensifying screens. The standard film and marketed as being of standard, fast or ultrafast speeds.

rare-earth screen

see rare-earth intensifying screen.

---

screen

Public health 1. Any systematic activity–eg, measuring BP, glucose or cholesterol, pap smear, or other activity, which attempts to identify a particular disease in persons in a particular population. See Drug screen, General health screen, Laxative screen, Memory Impairment screen, Metabolic screen, Neonatal screen.2. A solar protection barrier. See Sunscreen.