1. A touchscreen, comprising an electronic visualization structure comprising:
a first layer of electrically conductive material deposited on
second layer of electrochromic material deposited on
a third layer of electrolyte material deposited on
a fourth layer of electrochemically active material deposited on
a fifth layer of electrically conductive material;
a continuous source of modulated electrical stimuli; and
a sensor for sensing variations in the electric capacity of the electronic structure.
2. The touchscreen according to claim 1, wherein the electrochemically active material is electrochromic.
3. The touchscreen according to claim 1, wherein the electrically conductive material is deposited on a single continuous area.
4. The touchscreen according to claim 1, wherein the electrically conductive material is deposited on several areas, without direct continuity in between.
5. The touchscreen according to claim 1, wherein the electronic visualization structure is arrayed in a matrix in which each element of the matrix is electrically insulated from the other elements of the matrix.
6. The touchscreen, according to claim 1, comprising static patterns only, which alternate between at least two optical states.
7. The touchscreen according to claim 1, comprising several dynamic patterns, which alternate between at least two optical states.
8. The touchscreen according to claim 1, wherein the touch detection operates by measuring of signal frequency.
9. The touchscreen according to claim 1, wherein the touch detection operates by measuring of signal amplitude.
10. The touchscreen according to claim 1, wherein the touch detection operates by measuring of electric charge time.
11. The touchscreen according to claim 1, wherein the sensor comprises a modified Wheatstone bridge with a variable capacitor.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1-68. (canceled)
69. A method of forming a portal image, the method comprising: forming a two-dimensional image of an object of interest;
superimposing an image of a collimator element on said two-dimensional image, wherein said image represents the position of said collimator element when a radiation therapy beam is to be directed towards said object of interest.
70. The method of claim 69, wherein said two-dimensional image is formed from a volumetric image.
71. The method of claim 69, further comprising determining said position of said collimator element when said radiation therapy beam is to be directed towards said object of interest.
72. The method of claim 69, wherein said object of interest substantially changes position and shape during a therapy session and said two-dimensional image is a fluoroscopic image.
73. The method of claim 69, wherein said object of interest does not substantially change its position and shape during a therapy session and. said two-dimensional image is a radiographic image.