Basal billeddiagnostik 2 Flashcards

1
Q

Hvordan ser en overeksponeret knogle ud?

A

Meget mørk.

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2
Q

Hvordan ser en undereksponeret abdomen ud?

A

Meget lys.

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3
Q

Hvilken parameter har at gøre med kontrasten?

A

kV.

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4
Q

Hvad er årsager til dårlig kontrast?

A

Juvenilt dyr (Manglende fedt omkring organer),
Fri væske/Peritonitis,
Adipøst.

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5
Q

Hvad er årsager til manglende kontrast?

A

Sekundær stråling,

Bevægelsesuskarphed.

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6
Q

Hvordan kigger man på et røntgenbillede?

A

A radiograph should never be evaluated by holding it up for lumination from a ceiling-mounted light fixture
Review all radiographs in an appropriate environment
Radiograph film cannot be evaluated completely using only the illumination from a viewbox. Certain regions of the image are going to be dark, and an intense hot light is required for assessing the more heavely exposed film regions
Manipulating the blackness and contrast of a digital image electronically has eliminated the need for a hot light.

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7
Q

Hvis man har et undereksponeret (lyst) billede, hvad checker man så for at finde ud af, hvordan man kan lave optimal eksponering?

A

Man checker konturer.

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8
Q

Hvis et undereksponeret (for lyst) billede har tydelige konturer med god penetration, hvordan korrigerer man så for dette?

A

Ved at skrue op for mAs.

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9
Q

Hvis et undereksponeret (for lyst) billede har manglende konturer uden penetration, hvordan korrigerer man så for dette?

A

Ved at skrue op for kV.

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10
Q

Hvis man har et overeksponeret (mørkt) billede, hvad checker man så for at finde ud af, hvordan man kan lave optimal eksponering?

A

Man checker kontrasten.

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11
Q

Hvis et overeksponeret (for mørkt) billede har tydelige knogler med kontrast, hvordan korrigerer man så for dette?

A

Ved at skrue ned for mAs.

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12
Q

Hvis et overeksponeret (for mørkt) billede har utydelige knogler med ringe kontrast, hvordan korrigerer man så for dette?

A

Ved at skrue ned for kV.

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13
Q

Hvordan er kontrasten optimal?

A

Der skal være noget helt hvidt (knoglevæv) og noget helt sort.

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14
Q

Hvor meget skal man ændre mAs for at fordoble/halvere sværtningsgraden?

A

En fordobling/halvering af mAs giver en fordobling/halvering af sværtningsgraden.

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15
Q

Hvor meget skal man ændre kV for at fordoble/halvere sværtningsgraden?

A

Ændres kV med 10-15%, fordobles/halveres sværtningsgraden.

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16
Q

Hvad er konsekvenserne ved suboptimal røntgenoptagelse?

A

”At best, poor radiographs are totally useless and at worst, they are totally misleading”
Fejldiagnostik,
Overse forandringer,
Falske forandringer.

17
Q

Det var

A

det!