Phosphor screen and imaging assembly
AssigneeEastman Kodak Company
InventorsThomas M. Laney, David J. Steklenski
Life of this patent
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Abstract
A phosphor screen comprises an inorganic phosphor capable of absorbing X-rays and emitting electromagnetic radiation having a wavelength greater than 300 nm. The phosphor is disposed on a support that has a reflective substrate comprising a continuous polyester first phase and a second phase dispersed within the continuous polyester first phase. The second phase contains microvoids that in turn contain barium sulfate particles. This support provides improved reflectivity particularly at shorter wavelengths.
Claims28
A phosphor screen that comprises an inorganic phosphor capable of absorbing X-rays and emitting electromagnetic radiation having a wavelength greater than 300 nm, said inorganic phosphor being coated in admixture with a polymeric binder in a phosphor layer onto a flexible support,
- said flexible support comprising a multilayer reflective substrate comprising a first microvoided polyester layer comprising a continuous polyester first phase and a second phase dispersed within said continuous polyester first phase, said second phase comprised of microvoids containing barium sulfate particles, and
- a second microvoided polyester layer adjacent said first microvoided polyester layer, said second microvoided polyester layer comprising a continuous polyester first phase and a second phase dispersed with said continuous polyester first phase, said second phase comprised of microvoids, and
- the composition of said first and second microvoided polyester layers being the same or different except that barium sulfate particles have been omitted from said second microvoided polyester layer.
A radiographic imaging assembly comprising:
- A) a photosensitive silver halide-containing film comprising a support having first and second major surfaces,
- said photosensitive silver halide-containing film having disposed on at least said first major support surface, one or more photosensitive emulsion layers, and
- B) a phosphor screen that comprises an inorganic phosphor capable of absorbing X-rays and emitting electromagnetic radiation having a wavelength greater than 300 nm, said inorganic phosphor being coated in admixture with a polymeric binder in a phosphor layer onto a flexible support,
- said flexible support comprising a multilayer reflective substrate comprising a first microvoided polyester layer comprising a continuous polyester first phase and a second phase dispersed within said continuous polyester first phase, said second phase comprised of microvoids containing barium sulfate particles, and
- a second microvoided polyester layer adjacent said first microvoided polyester layer, said second microvoided polyester layer comprising a continuous polyester first phase and a second phase dispersed with said continuous polyester first phase, said second phase comprised of microvoids, and
- the composition of said first and second microvoided polyester layers being the same or different except that barium sulfate particles have been omitted from said second microvoided polyester layer.
A method of providing a radiographic image comprising:
- A) directing imaging X-radiation through a phosphor screen that comprises an inorganic phosphor capable of absorbing X-rays and emitting electromagnetic radiation having a wavelength greater than 300 nm, said inorganic phosphor being coated in admixture with a polymeric binder in a phosphor layer onto a flexible support, thereby causing said electomagnetic radiation to impinge on a photosensitive silver halide containing film comprising a support having first and film second major surfaces,
- said flexible support comprising a multilayer reflective substrate comprising a first microvoided polyester layer comprising a continuous polyester first phase and a second phase dispersed within said continuous polyester first phase, said second phase comprised of microvoids containing barium sulfate particles, and
- a second microvoided polyester layer adjacent said first microvoided polyester layer, said second microvoided polyester layer comprising a continuous polyester first phase and a second phase dispersed with said continuous polyester first phase, said second phase comprised of microvoids, and
- the composition of said first and second microvoided polyester layers being the same or different except that barium sulfate particles have been omitted from said second microvoided polyester layer,
- said photosensitive silver halide-containing film having disposed on at least said first major support surface, one or more photosensitive emulsion layers, to form a latent image in said film, and
- B) developing said latent image in said film.
Dependencies are inferred from the claim text.