Amendment to item 15565 for preparation of an intensity modulated radiotherapy (IMRT) dosimetry plan

On 1 May 2018, item 15565 will be amended to reflect developments in the methodology for dosimetric checks by removing references to the use of a dosimetric phantom

The schedule has the following wording for 15565:

Preparation of an IMRT DOSIMETRY PLAN, which uses one or more CT image volume datasets, if:

(a) in preparing the IMRT dosimetry plan:

(i) the differential between target dose and normal tissue dose is maximised, based on a review and assessment by a radiation oncologist; and

(ii) all gross tumour targets, clinical targets, planning targets and organs at risk are rendered as volumes as defined in the prescription; and

(iii) organs at risk are nominated as planning dose goals or constraints and the prescription specifies the organs at risk as dose goals or constraints; and

(iv) dose calculations and dose volume histograms are generated in an inverse planned process, using a specialised calculation algorithm, with prescription and plan details approved and recorded in 127 the plan; and

(v) a CT image volume dataset is used for the relevant region to be planned and treated; and

(vi) the CT images are suitable for the generation of quality digitally reconstructed radiographic images; and

(b) the final IMRT dosimetry plan is validated by the radiation therapist and the medical physicist, using robust quality assurance processes that include:

(i) determination of the accuracy of the dose fluence delivered by the multi-leaf collimator and gantryposition (static or dynamic); and

(ii) ensuring that the plan is deliverable, data transfer is acceptable and validation checks are completed on a linear accelerator; and

(iii) validating the accuracy of the derived IMRT dosimetry plan; and

(c) the final IMRT dosimetry plan is approved by the radiation oncologist prior to delivery.