RADIOGRAPHY FLAT PANEL DETECTOR HAVING A LOW WEIGHT X-RAY SHIELD AND THE METHOD OF PRODUCTION THEREOF
A radiography flat panel detector and a method of producing the flat panel detector that includes, in order, a scintillating or photoconductive layer, an imaging array, a first substrate, an X-ray shield including a second substrate, and an X-ray absorbing layer on a side of the second substrate, wherein the absorbing layer includes a binder and a chemical compound having a metal element with an atomic number of 20 or more and one or more non-metal elements.
1 - 10 . (canceled)
11 . A radiography flat panel detector comprising, in order:
a scintillating or photoconductive layer;
an imaging array;
a first substrate; and
an X-ray shield including a second substrate and an X-ray absorbing layer on a side of the second substrate; wherein
the X-ray absorbing layer includes a binder and a chemical compound having a metal element with an atomic number of 20 or more and one or more non-metal elements.
12 . The radiography flat panel detector according to claim 11 , wherein the second substrate consists essentially of materials selected from the group consisting of aluminium, polyethylene terephthalate, polyethylene naphthalate, polyimide, polyethersulphone, carbon fibre reinforced plastic, glass, cellulose triacetate, and a combination thereof or laminates thereof.
13 . The radiography flat panel detector according to claim 11 , wherein the second substrate is a flexible sheet.
14 . The radiography flat panel detector according to claim 12 , wherein the second substrate is a flexible sheet.
15 . The radiography flat panel detector according to claim 11 , wherein the second substrate is disposed between the first substrate and the X-ray absorbing layer.
16 . The radiography flat panel detector according to claim 12 , wherein the second substrate is between the first substrate and the X-ray absorbing layer.
17 . The radiography flat panel detector according to claim 11 , wherein the chemical compound is selected from the group consisting of CsI, Gd 2 O 2 S, BaFBr, CaWO 4 , BaTiO 3 , Gd 2 O 3 , BaCl 2 , BaF 2 , BaO, Ce 2 O 3 , CeO 2 , CsNO 3 , GdF 2 , PdI 2 , TeO 2 , SnI 2 , SnO, BaSO 4 , BaCO 3 , Bal, BaFX, RFX n , RF y O z , RF y (SO 4 ) z , RF y S z , RF y (WO 4 ) z , CsBr, CsCl, CsF, CsNO 3 , Cs 2 SO 4 , Osmium halides, Osmium oxides, Osmium sulphides, Rhenium halides, Rhenium oxides, and Rhenium sulphides or mixtures thereof;
X is a halide selected from the group of F, Cl, Br, and I;
RF is a lanthanide selected from the group of La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu; and
n, y, and z are independently an integer number higher than 1.
18 . The radiography flat panel detector according to claim 11 , wherein the X-ray shield is disposed between the first substrate and underlying electronics.
19 . The radiography flat panel detector according to claim 12 , wherein the X-ray shield is disposed between the first substrate and underlying electronics.
20 . The radiography flat panel detector according to claim 11 , wherein the binder is selected from the group of cellulose acetate butyrate, polyalkyl (meth)acrylates, polyvinyl-n-butyral, poly(vinylacetate-co-vinylchloride), poly(acrylonitrile-co-butadiene-co-styrene), poly(vinyl chloride-co-vinyl acetate-co-vinylalcohol), poly(butyl acrylate), poly(ethyl acrylate), poly(methacrylic acid), poly(vinyl butyral), trimellitic acid, butenedioic anhydride, phthalic anhydride, polyisoprene, and mixtures thereof.
21 . The radiography flat panel detector according to claim 12 , wherein the binder is selected from the group of cellulose acetate butyrate, polyalkyl (meth)acrylates, polyvinyl-n-butyral, poly(vinylacetate-co-vinylchloride), poly(acrylonitrile-co-butadiene-co-styrene), poly(vinyl chloride-co-vinyl acetate-co-vinylalcohol), poly(butyl acrylate), poly(ethyl acrylate), poly(methacrylic acid), poly(vinyl butyral), trimellitic acid, butenedioic anhydride, phthalic anhydride, polyisoprene, and mixtures thereof.
22 . The radiography flat panel detector according to claim 13 , wherein the binder is selected from the group of cellulose acetate butyrate, polyalkyl (meth)acrylates, polyvinyl-n-butyral, poly(vinylacetate-co-vinylchloride), poly(acrylonitrile-co-butadiene-co-styrene), poly(vinyl chloride-co-vinyl acetate-co-vinylalcohol), poly(butyl acrylate), poly(ethyl acrylate), poly(methacrylic acid), poly(vinyl butyral), trimellitic acid, butenedioic anhydride, phthalic anhydride, polyisoprene, and mixtures thereof.
23 . The radiography flat panel detector according to claim 11 , wherein an amount of the binder in the X-ray absorbing layer is 10% by weight or less.
24 . The radiography flat panel detector according to claim 12 , wherein an amount of the binder in the X-ray absorbing layer is 10% by weight or less.
25 . A method of making the radiography flat panel detector as defined in claim 11 , the method comprising the steps of:
providing the first substrate with the imaging array on a side of the first substrate;
adhering a scintillating phosphor onto the imaging array;
providing the second substrate;
coating the X-ray absorbing layer on the side of the second substrate; and
contacting either a side of the second substrate opposite to the X-ray absorbing layer or the X-ray absorbing layer with a side of the first substrate opposite to the imaging array.
26 . The method of making a radiography flat panel detector according to claim 25 , wherein the step of coating is performed using a knife or a doctor blade.