1. A particle beam therapy system that irradiates a charged particle beam, accelerated by an accelerator and scanned by a scanning electromagnet, onto an irradiation subject, the particle beam therapy system comprising:
an irradiation management apparatus that controls the scanning electromagnet, based on target irradiation position coordinates of the charged particle beam; and
a position monitor that measures measurement position coordinates of the charged particle beam, wherein the irradiation management apparatus has a command value creator that outputs a control input to the scanning electromagnet, for scanning the charged particle beam, based on the target irradiation position coordinates and correction data, said correction data having been created in a preliminary irradiation,
wherein (i) said preliminary irradiation is performed prior to said irradiation of said subject and (ii) an excitation pattern of the scanning electromagnet of said preliminary irradiation is the same as an excitation pattern of the scanning electromagnet of a main irradiation plan for actual irradiation of the subject, and
wherein the correction data is created on a basis of the target irradiation position coordinates and the measurement position coordinates measured by the position monitor in said preliminary irradiation.
2. The particle beam therapy system according to claim 1, wherein, the irradiation management apparatus includes (i) a correction data creator that creates the correction data in said preliminary irradiation and (ii) a scanning electromagnet command value creator that creates a basic control input from the measurement position coordinates, wherein
the command value creator outputs, as the control input, a corrected control input obtained by correcting the basic control input, created by the scanning electromagnet command value creator, with the correction data created by the correction data creator.
3. The particle beam therapy system according to claim 2, wherein the correction data is created based on a value obtained by dividing by a coefficient K the difference \u0394BL between the value BL(me) of a BL product of the scanning electromagnet calculated from the measurement position coordinates measured in the preliminary irradiation and the value BL(ex) of a BL product of the scanning electromagnet calculated from the target irradiation position coordinates; and
the coefficient K is a gradient of a tangential line at a point, at which the value of the BL product is BL(ex), on the center line of the hysteresis loop configured with the BL product and the current of the scanning electromagnet.
4. The particle beam therapy system according to claim 3, wherein the irradiation management apparatus has a determination device that determines whether or not the position difference between the measurement position coordinates and the target irradiation position coordinates falls within a predetermined tolerance range; in the case where the position difference does not fall within the predetermined range, the irradiation management apparatus creates the correction data; and in the case where the position difference falls within the predetermined range, the irradiation management apparatus sets the control input to the scanning electromagnet to a value the same as a value in the preliminary irradiation.
5. The particle beam therapy system according to claim 2, wherein the irradiation management apparatus has a determination device that determines whether or not the position difference between the measurement position coordinates and the target irradiation position coordinates falls within a predetermined tolerance range; in the case where the position difference does not fall within the predetermined range, the irradiation management apparatus creates the correction data; and in the case where the position difference falls within the predetermined range, the irradiation management apparatus sets the control input to the scanning electromagnet to a value the same as a value in the preliminary irradiation.
6. The particle beam therapy system according to claim 1, wherein the correction data is created based on a value obtained by dividing by a coefficient K the difference \u0394BL between the value BL(me) of a BL product of the scanning electromagnet calculated from the measurement position coordinates measured in the preliminary irradiation and the value BL(ex) of a BL product of the scanning electromagnet calculated from the target irradiation position coordinates; and
the coefficient K is a gradient of a tangential line at a point, at which the value of the BL product is BL(ex), on the center line of the hysteresis loop configured with the BL product and the current of the scanning electromagnet.
7. The particle beam therapy system according to claim 6, wherein the irradiation management apparatus has a determination device that determines whether or not the position difference between the measurement position coordinates and the target irradiation position coordinates falls within a predetermined tolerance range; in the case where the position difference does not fall within the predetermined range, the irradiation management apparatus creates the correction data; and in the case where the position difference falls within the predetermined range, the irradiation management apparatus sets the control input to the scanning electromagnet to a value the same as a value in the preliminary irradiation.
8. The particle beam therapy system according to claim 1, wherein the irradiation management apparatus has a determination device that determines whether or not the position difference between the measurement position coordinates and the target irradiation position coordinates falls within a predetermined tolerance range; in the case where the position difference does not fall within the predetermined range, the irradiation management apparatus creates the correction data; and in the case where the position difference falls within the predetermined range, the irradiation management apparatus sets the control input to the scanning electromagnet to a value the same as a value in the preliminary irradiation.
9. An irradiation method for irradiating a charged particle beam onto an irradiation subject, the method comprising:
creating irradiation setting data, said setting data including at least target irradiation position coordinates and dosage amounts;
outputting a control input to a scanning electromagnet performing a preliminary irradiation according to said setting data, wherein (i) said preliminary irradiation is performed prior to performing an actual irradiation on a subject and (ii) a scanning-electromagnet excitation pattern of the preliminary irradiation is the same as a scanning-electromagnet excitation pattern of actual irradiation;
recording, in said preliminary irradiation, measurement data including at least measurement position coordinates;
creating correction data based on the target irradiation position coordinates and the measurement position coordinates measured in said preliminary irradiation; and
correcting the control input to the scanning electromagnet based on the correction data created in preliminary irradiation to create a corrected control input for actual irradiation on a subject.
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. An EMI shield for an electronic system enclosure, comprising:
an electrically conductive panel having a plurality of air ventilation channels, wherein the electrically conductive panel has an upstream airflow side and a downstream airflow side;
a first air ventilation channel with a first cross-sectional shape having a first cross-sectional area and a first depth and
a second air ventilation channel with a second cross-sectional shape, having a cross-sectional area greater than the first cross-sectional area, and a second depth larger than the first depth.
2. An EMI shield according to claim 1, wherein the air ventilation channels are adapted to attenuate EMI emissions from the electronic system.
3. An EMI shield according to claim 2, wherein the air ventilation channels are electrically conductive ducts having a substantially constant and unrestricted cross sectional area, extending outwards from the electrically conductive panel.
4. An EMI shield according to claim 3, wherein the air ventilation channels are formed using a pierce and extrude process, having substantially constant and unrestricted cross sectional areas.
5. An EMI shield according to claim 2, wherein the air ventilation channels are voids in the electrically conductive panel, having substantially constant and unrestricted cross sectional areas.
6. An EMI shield according to claim 1, wherein the air ventilation channels have a substantially constant and unrestricted circular cross sectional area.
7. An EMI shield according to claim 1, wherein the air ventilation channels have a substantially constant and unrestricted polygonal cross sectional area.
8. An EMI shield according to claim 1, wherein the first air ventilation channel has a first cross-sectional shape, and the second air ventilation channel has a second cross-sectional shape different than the first cross-sectional shape.
9. An EMI shield for an electronic system enclosure, comprising:
an electrically conductive panel having a plurality of air ventilation channels, wherein the electrically conductive panel has an upstream airflow side and a downstream airflow side, and the electrically conductive panel has a first thickness and a second thickness greater than the first thickness.
10. An EMI shield according to claim 9, wherein the air ventilation channels are adapted to attenuate EMI emissions from the electronic system enclosure.
11. An EMI shield according to claim 10, wherein the first thickness and the second thickness provide accommodation for proximity of components to the electrically conductive panel.
12. An EMI shield according to claim 11, wherein the first thickness is adapted to allow a component of the electronic system to extend outward from the electronic system enclosure through the EMI shield.
13. An EMI shield according to claim 9, wherein the air ventilation channels are oriented to extend away from the electrically conductive panel in a direction approximately normal to the electrically conductive panel.
14. An EMI shield according to claim 9, wherein the air ventilation channels are oriented to extend away from the electrically conductive panel in a direction significantly different than normal to the electrically conductive panel.
15. An EMI shield according to claim 9, wherein the electrically conductive panel thickness varies between a first air ventilation channel of a first depth and a first cross-sectional area, and a second air ventilation channel of a second depth greater than the first depth, having a second cross-sectional area greater than the first cross-sectional area.
16. A method, comprising:
determining the proximity of electronic components within an electronic system enclosure to an EMI shield comprising an electrically conductive panel;
determining cooling airflow needs of the electronic components;
determining EMI shielding needs of the electronic system enclosure for a range of electromagnetic emission frequencies;
determining the cross-sectional shape, cross-sectional area, depth, quantity, and arrangement of air ventilation channels in the EMI shield to improve cooling of components of an electronic system shielded by the electronic system enclosure, while providing adequate EMI shielding at the range of electromagnetic emission frequencies;
analyzing the above determinations and creating a first air ventilation channel with a first cross-sectional shape, cross-sectional area and a first depth, and a second air ventilation channel with a second cross-sectional area greater than the first cross-sectional area, and a second depth greater than the first depth in the EMI shield and
incorporating the created air ventilation channel cross-sectional shape, cross-sectional area, depth, quantity, and arrangement data into an EMI shield design data.
17. The method of claim 16, wherein determining cooling airflow needs of the electronic components and determining cross-sectional shape, cross-sectional area, depth, quantity, and arrangement of air ventilation channels in the EMI shield includes a computer-based thermal flow simulation.
18. The method of claim 16, wherein incorporating the determined cross-sectional shape, cross-sectional area, depth, quantity, and arrangement of air ventilation channels in the EMI shield design data involves creating and modifying a computer-based representation of three-dimensional design structures.
19. The method of claim 16, wherein determining the EMI shielding needs of the electronic system enclosure includes a computer-based electromagnetic simulation.