1. A display header for a rack display system having a rear wall, top wall extending normally from the rear wall, and a terminal flange on the top wall wherein the rear wall has at least one horizontal channel, the display header comprising:
at least one light transmissive flexible plastic panel having a top edge, a bottom edge, and side edges,
a flange extending normally from the at least one light transmissive flexible plastic panel at the top edge,
means to attach the flange to one of the top wall or the terminal flange, and
indicia on the at least one light transmissive flexible plastic panel,
wherein the bottom edge is configured to lodge in the horizontal channel so that when the flange is attached to the top wall or to the terminal flange, the at least one light transmissive flexible plastic panel will have a convex shape between the rear wall and the top wall as a display header with the indicia visible thereon and wherein the at least one light transmissive flexible plastic panel is mounted adjacently to a second flexible panel at the side edges.
2. The display header of claim 1 wherein the at least one light transmissive flexible plastic panel is transparent.
3. The display header of claim 1 wherein the at least one light transmissive flexible plastic panel is translucent.
4. The display header of claim 1 wherein the means to attach the flange to the top wall comprises at least one of a mechanical fastener or an opening in the top wall for receiving the mechanical fastener.
5. The display header of claim 1 wherein the means to attach the flange to the terminal flange comprises at least one of a mechanical fastener or an opening in the terminal flange for receiving the mechanical fastener.
6. The display header of claim 1 wherein the light transmissive flexible plastic panel is configured to one of display words, graphics, or video.
7. The display header of claim 1 further comprising
at least one flexible display panel,
and means to attach the at least one flexible display panel to the at least one light transmissive flexible plastic panel, wherein the indicia is on the at least one flexible display panel.
8. The display header of claim 7 wherein the means to attach the at least one flexible display panel to the at least one light transmissive flexible plastic panel is removable.
9. The display header of claim 7 wherein the at least one flexible display panel extends over adjacent light transmissive flexible plastic panel.
10. The display header of claim 7 wherein one of the at least one light transmissive flexible plastic panel or the at least one flexible display panel is transparent.
11. The display header of claim 7 wherein one of the at least one light transmissive flexible plastic panel or the at least one flexible display panel is translucent.
12. The display header of claim 7 wherein the at least one light transmissive flexible panel or the at least one flexible display panel is PETG.
13. The display header of claim 7 wherein the at least one flexible display panel is configured to display words, graphics, video, or other media.
14. The display header of claim 7 wherein the at least one flexible display panel is formed of at least one of plastic paper, banner material, film, or electronic display.
15. A display header for a rack display system having a rear wall, top wall extending normally from the rear wall, and a terminal flange on the top wall wherein the rear wall has at least one horizontal channel, the display header comprising:
at least one light transmissive flexible plastic panel having a top edge, a bottom edge, and side edges,
a flange extending normally from the at least one light transmissive flexible plastic panel at the top edge,
means to attach the flange to one of the top wall or the terminal flange, and
indicia on the at least one light transmissive flexible plastic panel,
wherein the bottom edge is configured to lodge in the horizontal channel so that when the flange is attached to the top wall or to the terminal flange, the at least one light transmissive flexible plastic panel will have a convex shape between the rear wall and the top wall as a display header with the indicia visible thereon and wherein the at least one light transmissive flexible plastic panel is PETG.
16. A display header for a rack display system having a rear wall, top wall extending normally from the rear wall, and a terminal flange on the top wall wherein the rear wall has at least one horizontal channel, the display header comprising:
at least one light transmissive flexible plastic panel having a top edge, a bottom edge, and side edges,
a flange extending normally from the at least one light transmissive flexible plastic panel at the top edge,
means to attach the flange to one of the top wall or the terminal flange,
indicia on the at least one light transmissive flexible plastic panel,
and means to attach the at least one flexible display panel to the at least one light transmissive flexible plastic panel, wherein the indicia is on the at least one flexible display panel
wherein the bottom edge is configured to lodge in the horizontal channel so that when the flange is attached to the top wall or to the terminal flange, the at least one light transmissive flexible plastic panel will have a convex shape between the rear wall and the top wall as a display header with the indicia visible thereon and wherein the means to attach the at least one flexible display panel to the at least one light transmissive flexible plastic panel includes adhesive magnetic strips.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for linearizing attenuation measurements obtained by means of a direct conversion spectrometer comprising a radiation source and a detector for detecting said radiation after it has passed through an object, an attenuation measurement being represented by a vector Md giving the attenuation of the radiation in a plurality Nk of energy channels of the detector, the actual attenuation of the material constituting the object being resolved according to a characteristic base of the attenuation in this material, \u03bcn, n=1, . . . , N with N\u22672;
said spectrometer being characterized by a response matrix \u03a8 giving, for a plurality Nk of energy channels of the detector, the probability that a photon emitted in an energy bin h=1, . . . , Nh is detected in an energy channel,
said method being characterized in that it estimates a vector Mlin, called an equivalent linear attenuation vector, giving for each energy channel an attenuation linearly depending on the thickness of material through which the radiation passes, said method comprising an initialization step (510, 610) wherein Mlin is estimated by the attenuation measurement Md and a succession of iterations, each iteration j providing an estimate {circumflex over (M)}lin(j) and comprising:
(a) a step (520, 620) of projecting the estimate {circumflex over (M)}lin(j\u22121) of Mlin obtained at the previous iteration onto an image base \u03a8\u03bcn, n=1, . . . , N, image by said response matrix \u03a8 of said characteristic base of the attenuation of the material;
(b) a step of determining an energy non linear deformation, T, (530, 631-633) of the components of the estimate {circumflex over (M)}lin(j\u22121) for obtaining a corresponding attenuation Mrd(j) in said different energy channels, in accordance with a non linear model of the spectrometer;
(c) a step (540, 640) of reverse deformation of the components of Md to provide a new estimate {circumflex over (M)}lin(j) of the equivalent linear attenuation Mlin of said attenuation measurement, or of the components \u01091, . . . , \u0109N of said equivalent linear attenuation Mlin in said image base.
2. The method for linearizing attenuation measurements according to claim 1, characterized in that the iterations are stopped (550) when a predetermined number (jmax) of iterations is reached.
3. The method for linearizing attenuation measurements according to claim 1, characterized in that the iterations are stopped (550) when a convergence criterion of the estimate of the equivalent linear attenuation is met.
4. The method for linearizing attenuation measurements according to claim 1, characterized in that the characteristic base of the material is a base of vectors \u03bcCo, \u03bcPh where \u03bcCo gives the linear attenuation coefficient of the radiation due to the Compton effect in the different energy bins and \u03bcPh gives the attenuation coefficient of the radiation due to the photoelectric effect in the different energy bins, the vector of the actual attenuation coefficients \u03bci of the material in these different bins being obtained as a linear combination of the vectors \u03bcCo, \u03bcPh.
5. The method for linearizing attenuation measurements according to claim 1, characterized in that the characteristic base of the material is a base of vectors \u03bcn, n=1, . . . , N, relating to reference materials, each vector of this base giving the actual attenuation coefficients in the different energy bins for a reference material.
6. The method for linearizing attenuation measurements according to claim 1, characterized in that in step (a) of an iteration j, a vector \u0109j of size N is determined giving the components of {circumflex over (M)}lin(j\u22121) in the image base \u03a8\u03bcn, n=1, . . . , N.
7. The method for linearizing attenuation measurements according to claim 6, characterized in that the non-linear transformation T is determined by estimating (631) the actual attenuation in the material from {circumflex over (M)}i(j)=B\u03bc\u0109j, where B\u03bc is a matrix the columns of which consist of the vectors \u03bcn, n=1, . . . , N, and by calculating (633) the diagonal matrix Wjd such that Wjd{circumflex over (M)}lin(j\u22121)=Mrd(j) where Mrd=\u2212ln(\u03a8e\u2212B\u03bc\u0109j).
8. The method for linearizing attenuation measurements according to claim 7, characterized in that in step (c) of the iteration j, the new estimate {circumflex over (M)}lin(j) of the equivalent linear attenuation is obtained (540, 640) by means of {circumflex over (M)}lin(j)=(Wjd)\u22121Md.
9. The method for linearizing attenuation measurements according to claim 1, characterized in that it further provides a characterization of the material from the components \u01091, . . . , \u0109N of said equivalent linear attenuation Mlin in said image base.
10. The method for linearizing attenuation measurements according to claim 5, characterized in that said characterization is a composition of the material in said reference materials.