The influence of grid size on accuracy in radiotherapy dose plotting.
The recent article by Niemierko and Goitein [Med. Phys. 16, 239-247 (1989)] illustrates well the errors which are occurring in plotting isodose lines. We wish to augment their analysis with similar work done at Cardiff a few years ago; to indicate some practical treatment outcomes they have omitted; to propose even more stringent requirements of the grid size used; and thus to further alert users and software manufacturers to this problem.
Smith
C W
CW
Department of Medical Physics and Bioengineering, South Wales Radiotherapy and Oncology Centre, Velindre Hospital, Cardiff, United Kingdom.
Morrey
D
D
Gray
K
K
D006801:Humans; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted; D011881:Radiotherapy, Computer-Assisted; D013679:Technology, Radiologic