Method for performing in vivo dosimetry
First Claim
1. Method for enabling quantification of dose delivery in radiotherapy treatment, characterized in that it comprises the steps ofirradiating a phantom,obtaining measurements in said phantom,collecting information regarding the irradiation by information means arranged between the phantom and the radiation source, wherein said measurements are divided in time-intervals,analysing the measurements, andobtaining information regarding the relationship between the measurements in the phantom and the information between the phantom and the treatment source at each time-interval, which relationship information is to be used as verification of the treatment of a patient.
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Abstract
The present invention relates to a method enabling quantification of dose delivery in radiotherapy treatment during patient-specific treatment of the patient utilizing measurements in predefined time-intervals with information means positioned in the radiation beam, between the patient and the source and converting the readings to corresponding measures in a phantom. The invention additionally covers the method to obtain the said calibration factors for the detectors. The said calibration factors are obtained for each information means, field and said definable time-interval simultaneously irradiating the information means and said phantom including detectors to measure the absorbed dose using the said patient-specific treatment without patient.
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Citations
28 Claims
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1. Method for enabling quantification of dose delivery in radiotherapy treatment, characterized in that it comprises the steps of
irradiating a phantom, obtaining measurements in said phantom, collecting information regarding the irradiation by information means arranged between the phantom and the radiation source, wherein said measurements are divided in time-intervals, analysing the measurements, and obtaining information regarding the relationship between the measurements in the phantom and the information between the phantom and the treatment source at each time-interval, which relationship information is to be used as verification of the treatment of a patient.
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22. Method for enabling quantification of dose delivery in radiotherapy treatment, characterized in that it comprises the steps of
irradiating of a phantom, obtaining measurements in said phantom, collecting information regarding the irradiation by information means arranged between the phantom and the radiation source, wherein said measurements are divided in time-intervals, characterized in that the information means comprises detectors (ExtDet), analysing the measurements, obtaining information regarding the relationship between the measurements in the phantom and the information between the phantom and the treatment source at each time-interval, which relationship information is to be used as verification of the treatment of a patient, and calculating calibration factors from the obtained relationship information as the ratio of the reading from information from the information means and the measurements alone the radiation ray in the phantom, characterized in that the calibration factor are calculated according to,
Caln,f,seg−- n,f,p,t(i),t(i+1)=Sn,f,t(i),t(i+1)/(Dseg−
n,f,p,t(i),t(i+1))where Dseg−
n,f,p,t(i),t(i+1) The dose in point p in the phantom-segment defined by the DetExt detector-element, n and the field (projection), f integrated from time t(i) until t(i+1)Sn,f,t(i),t(i+1)The signal from the ExtDet detector-element, n, in the field, f, integrated from time t(i) until t(i+1) Caln,f,seg−
n,f,p,t(i),t(i+1) The calibration factor to be used with ExtDet detector-element n, in the field, f, to convert the signal integrated from time t(i) until t(i+1) to achieve the dose in the point p in the phantom-segment defined by the DetExt detector-element, n and the field (projection), f integrated from time t(i) until t(i+1).- View Dependent Claims (23)
- n,f,p,t(i),t(i+1)=Sn,f,t(i),t(i+1)/(Dseg−
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24. Method for enabling quantification of dose delivery in radiotherapy treatment, characterized in that it comprises the steps of
irradiating of a phantom, obtaining measurements in said phantom, collecting information regarding the irradiation by information means arranged between the phantom and the radiation source, wherein said measurements are divided in time-intervals, characterized in that the information means comprises the position of Multi Leaf Collimator leafs (MLC) arranged for shaping the irradiating beam of the radiation source, analysing the measurements, obtaining information regarding the relationship between the measurements in the phantom and the information between the phantom and the treatment source at each time-interval, which relationship information is to be used as verification of the treatment of a patient, and calculating calibration factors from the obtained relationship information as the ratio of the reading from information from the information means and the measurements along the radiation ray in the phantom, characterized in that the calibration factors are calculated according to
Caln,f,p,t(i),t(i+1)=Fn,f,t(i),t(i+1)/(Df,p,t(i),t(i+1))where Df,p,t(i),t(i+1) The dose in point p in the phantom at the field (projection), f integrated from time t(i) until t(i+1) Fn,f,t(i),t(i+1) The radiation fluency in the field, f, between the patient and the source along the ray that intersects point p in the phantom integrated from time t(i) until t(i+1) Caln,f,p,t(i),t(i+1) The calibration factor describing the relation between the fluency between the patient and the source and the dose in the phantom.
Specification