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What is the meaning of oblique sign?

Oblique may refer to: an alternative name for the character usually called a slash (punctuation) ( / ) Oblique angle, in geometry. Oblique triangle, in geometry. Oblique leaf base, a characteristic shape of the base of a leaf.

What does oblique mean in science?

1. Not erect or perpendicular; neither parallel to, nor at right angles from, the base; slanting; inclined.

How can I turn my baby head down naturally?

Natural methods

  1. Breech tilt, or pelvic tilt: Lie on the floor with your legs bent and your feet flat on the ground. …
  2. Inversion: There are a few moves you can do that use gravity to turn the baby. …
  3. Music: Certain sounds may appeal to your baby. …
  4. Temperature: Like music, your baby may respond to temperature.

What is the difference between malposition and Malpresentation?

Malpositions are abnormal positions of the vertex of the fetal head (with the occiput as the reference point) relative to the maternal pelvis. Malpresentations are all presentations of the fetus other than vertex. The fetus is in an abnormal position or presentation that may result in prolonged or obstructed labour.

What does oblique mean in radiology?

In radiology, an alignment of the body between a lateral and an anteroposterior or posteroanterior position. The angle formed by the body surface and the image receptor may vary.

What is positioning in radiology?

Radiographic positioning terminology is used routinely to describe the position of the patient for taking various radiographs. Standard nomenclature is employed with respect to the anatomic position.

What does Projection mean in radiology?

Projection refers to the way the x-ray beam, like an arrow, passes through the body when the person is in that position. … In the posteroanterior projection (PA), the x-ray beam enters the back of the person and exits the front of the person. This means the IR is in front of the person.

What is the central ray in radiology?

The theoretical center of an x-ray beam. The term designates the direction of the x-ray photons as projected from the focal spot of the x-ray tube to the radiographical film. See also: ray.

What is remnant beam?

Remnant (Exit) Radiation. • Definition: what remains of the primary beam after it has been attenuated by matter (the patient). • Tissues of different density, or atomic number, in the body absorb x-rays differently and therefore emit x-rays differently.

What is secondary radiation?

Secondary radiation refers to radiation originating from the absorption of previous radiation in matter. It may be in the form either of electromagnetic waves or of moving particles.

What is a Bucky in radiography?

A bucky, is a device found underneath the exam table, a drawer like device that the cassette and grid is slid into before shooting x-ray. … A reciprocating bucky is a device that moves the grid while the x ray is being taken. The motion keeps the lead strips from being seen on the image.

What is a Bucky?

A Bucky is a component of x-ray units that holds the x-ray film cassette and moves the grid during x-ray exposure. The motion keeps the lead strips from being seen on the x-ray picture. The name refers to Dr.

What is Bucky factor?

The Bucky factor is the ratio of radiation on the anti-scatter grid to the transmitted radiation. Hence, the Bucky factor reflects the increased radiation dose required from anti-scatter grid use, as any increase in mAs proportionally increases dose. The Bucky factor changes with: … change in grid ratio.

What is air gap technique?

The air gap technique is a radiographic technique that improves image contrast resolution through reducing the amount of scattered radiation that reaches the image detector. … The air gap technique is utilized in both plain radiography and mammography.

Why does the air gap technique work?

1 INTRODUCTION. Air gap technique is a well‐known method to reduce the amount of scattered x‐ray radiation reaching the detector, thus reducing noise and improving image contrast. It is rather commonly utilized instead of a conventional grid in plain radiography.

What is high kV technique?

The kilovoltage (kV) during the radiographic examination will determine the primary beams’ energy; higher energy effects increased penetrating power. … Hence the high kV technique of the chest x-ray is employed to present a more uniformly dense image to better appreciate the lung markings.

What causes penumbra in radiology?

Penumbra is created by the size of focal spot (source of radiation), the larger the spot size the greater is the penumbra (the amount of un sharpness).

What does penumbra mean?

1a : a space of partial illumination (as in an eclipse) between the perfect shadow on all sides and the full light. b : a shaded region surrounding the dark central portion of a sunspot.

How penumbra is formed?

A “penumbra” is that region around the umbra where the shadow is only partial, or imperfect. You get these when the light source is larger than a single point. These form because while some of the light from the source gets blocked by the shadowing object, not all of it does.

What is penumbra effect?

In pathology and anatomy the penumbra is the area surrounding an ischemic event such as thrombotic or embolic stroke. Immediately following the event, blood flow and therefore oxygen transport is reduced locally, leading to hypoxia of the cells near the location of the original insult.

What is a penumbra brain?

Abstract. Ischemic penumbra was first defined by Astrup in 1981 as perfused brain tissue at a level within the thresholds of functional impairment and morphological integrity, which has the capacity to recover if perfusion is improved.

What is a penumbra in government?

The rights guaranteed by implication in a constitution or the implied powers of a rule. The original and literal meaning of penumbra is “a space of partial illumination between the perfect shadow … on all sides and the full light” (Merriam Webster’s Collegiate Dictionary, 10th ed., 1996).

What is heel effect in radiology?

Anode heel effect refers to the lower field intensity towards the anode in comparison to the cathode due to lower x-ray emissions from the target material at angles perpendicular to the electron beam.