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An isocenter detection and verification device for use in proton therapy
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10.1063/1.4771576
/content/aip/journal/rsi/83/12/10.1063/1.4771576
http://aip.metastore.ingenta.com/content/aip/journal/rsi/83/12/10.1063/1.4771576

Figures

Image of FIG. 1.
FIG. 1.

Three parts of the device. (a) Support arm to fix a device on the treatment couch. (b) This part is used to match the device to the center of the digital radiography system. (c) Instrument used to affix a film or IP.

Image of FIG. 2.
FIG. 2.

Schematic diagram of our new device. Dash line is crossed to multiple shows the slit proton beam. While (b) cannot essentially be divided apart, the figure shows to make it easy to see. Figure is not shown four pairs of magnet to attach the (b) and (c).

Image of FIG. 3.
FIG. 3.

Internal construction of Fig. 2(b). The position of the center steel ball is indicated by the black dashed arrow. The four magnets used for fixation are indicated by black arrows.

Image of FIG. 4.
FIG. 4.

Cross line of a cardinal angle is indicated by the black arrows.

Image of FIG. 5.
FIG. 5.

Internal construction of Fig. 1(c). The four magnets are indicated by black arrows.

Image of FIG. 6.
FIG. 6.

First set-up step is matching the room laser to the cross line on the frame. The device is view from lateral.

Image of FIG. 7.
FIG. 7.

Second set-up step is matching the steel ball to the image center of the digital radiography system.

Image of FIG. 8.
FIG. 8.

Patient collimator for producing a 2 mm slit proton beam.

Image of FIG. 9.
FIG. 9.

Two patterns of irradiation angles. We performed the star-shots method using these angles. (a) Conditions for CW angles. (b) Conditions for CCW angles.

Image of FIG. 10.
FIG. 10.

Analysis of the results for the star-shots method. Blue cross indicates the center of the rotational gantry. Red cross indicates the center of the digital radiography system define by the pin mark in the second step described. Sky blue dashed lines indicate each beam axis.

Tables

Generic image for table
Table I.

Measurement results for the differences between the rotational gantry and the digital radiography system isocenters over five weeks.

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/content/aip/journal/rsi/83/12/10.1063/1.4771576
2012-12-19
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: An isocenter detection and verification device for use in proton therapy
http://aip.metastore.ingenta.com/content/aip/journal/rsi/83/12/10.1063/1.4771576
10.1063/1.4771576
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