W Que et al 2004 Phys. Med. Biol. 49 399 doi:10.1088/0031-9155/49/3/004
W Que1,2,3, J Kung4 and J Dai5
Show affiliationsThe 'tongue-and-groove problem' in step-and-shoot delivery of intensity modulated radiotherapy is investigated. A 'tongue-and-groove' index (TGI) is introduced to quantify the 'tongue-and-groove' effect in step-and-shoot delivery. Four different types of leaf sequencing methods are compared. The sliding window method and the reducing level method use the same number of field segments to deliver the same intensity map, but the TGI is much less for the reducing level method. The leaf synchronization method of Van Santvoort and Heijmen fails in step-and-shoot delivery, but a new method inspired by the method of Van Santvoort and Heijmen is shown to eliminate 'tongue-and-groove' underdosage completely.
Issue 3 (7 February 2004)
Received 20 May 2003
Published 16 January 2004
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