Dosisverifikation mit Delta 4 Discover während der Behandlung
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1 Dosisverifikation mit Delta 4 Discover während der Behandlung Anders Adolfson, Regional Sales Manager at Scandidos AK IMRT 2015 in Erlangen, March 19 th 2015
2 Agenda Which problem does Delta 4 Discover solve? What does Delta 4 Discover do? Why is Delta 4 Discover better?
3 Agenda Which problem does Delta 4 Discover solve? What does Delta 4 Discover do? Why is Delta 4 Discover better?
4 Problem to be solved
5 Problem to be solved
6 Problem to be solved Small irregularities are very frequent (hundred(s)/year/clinic) Accidents occur An accident is the coincidence of very common irregularities radiotherapy errors and near misses were reported voluntary by 49 NHS hospitals across the UK during three months. 2% of these were reportable events under the The Ionising Radiation (Medical Exposure) Regulations.i.e. in average 2 events/clinic/year. Source: The radiotherapy newsletter of Public Health England Supplementary Data Analysis Issue 13 Full quarterly radiotherapy error data analysis March 2014 to May PHE publications gateway number:
7 Problem to be solved Delta 4 Discover
8 Problem to be solved Target in position Dose delivery correct
9 Problem to be solved Target in position Dose delivery correct
10 What is Delta 4 Discover? Transmission detector with 4040 p-type diodes Retains linac clearance 1 From first to last fraction 2 High operator satisfaction No interaction required Wireless Retractable (to check light field) 1 Delta4 Discover is within the protected zone of Varian s laser guard 2 Beam attenuation: 1% (6MV) Increase in surface dose : 1% for 10x10, 6MV
11 Agenda Which problem does Delta 4 Discover solve? What does Delta 4 Discover do? Why is Delta 4 Discover better?
12 What does Delta 4 Discover do? Verify that dose delivery is correct Automatically in the background (alerts only if dose is outside user defined pass/fail criteria)
13 Deviations? Where? (clinical significance!) Reason? MLC submillimeter precision Output 0.4% accuracy Gantry/collimator angle check
14 Agenda Which problem does Delta 4 Discover solve? What does Delta 4 Discover do? Why is Delta 4 Discover better?
15 Why is Delta 4 Discover better?
16 Why is Delta 4 Discover better? Thin No clearance reduction (Varian) Only 23 mm from front-surface of Varian-collimator Within Varian laser-guard
17 Why is Delta 4 Discover better? Thin (regarding beam absorption) Increase of skin dose ~1% Decrease of dose in Dmax ~1%
18 Why is Delta 4 Discover better? Tiny detectors (1mm diameter) important for measuring in high gradients
19 Why is Delta 4 Discover better? High resolution (2.5mm at isocenter) important for MLC determination
20 Why is Delta 4 Discover better? ODI + Lightfield Optical distance indicator visible all the time Detector can slide out to see the field light on the patient
21 Why is Delta 4 Discover better? FFF (and flattened beams, off course) Conformal, VMAT, IMRT,
22 Summary Yes: you have irregularities in your RT process Yes, there is a risk for accidents Yes, you can be confident that you deliver the correct dose: Delta 4 Discover
23 Treatment process Diagnosis Prescription Planning & Prescription Treatment planning Preparation and simulation Preparations Treatment flow Treatment Treatment TPS verification Pre Treatment Verification Patient Dosimetry Quality assurance
24 Treatment process Diagnosis Prescription Planning & Prescription Treatment planning Preparation and simulation Preparations Treatment flow Treatment Treatment Scandidos solutions Delta 4 TPV Treatment Planning verification Delta 4 phantom+ Hexamotion Delta 4 Discover
25 Delta 4 Phantom+ For pre treatment verification Completely Wireless
26 Delta 4 Phantom+ An improved Delta 4PT, completely wireless Now even more efficient Completely wireless 5 years calibration interval Insert for ionization chamber With retained benefits: No manual lifting True 3D measure where it really matters - in the target region Instant approval of plans
27 HexaMotion 6D Motion Managment QA What do I gain from tracking/gating? Do I hit the target?
28 Treatment process Diagnosis Prescription Planning & Prescription Treatment planning Preparation and simulation Preparations Treatment flow Treatment Treatment Scandidos solutions Delta 4 TPV Treatment Planning verification Delta 4 phantom+ Hexamotion Delta 4 Discover
29 What is Delta 4 TPV? TPS plan good and correct? Target covered? Dose to OAR acceptable? Dose calculation correct?
30 From Prescription to final THANK treatment YOU! fraction Diagnosis Prescription Treatment planning Preparation and simulation Treatment Planning & Prescription Preparations Treatment Treatment flow Scandidos solutions Delta 4 TPV Treatment Planning verification Delta 4 phantom+ Hexamotion Delta 4 family Quality covers assurance the treatment process! Delta 4 Discover
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