The matching of adjacent fields in radiotherapy.

Radiology (Impact Factor: 6.21). 09/1973; 108(2):419-22. DOI: 10.1148/108.2.419
Source: PubMed
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    ABSTRACT: If the target volume cannot be included with one field at head and neck cancer, we commonly used two or more field. It is very important to irradiate uniform dose at junction area of the fields. However, according to body shape of patient or general condition of patient, skin junction area can be matched incorrect, So overdose area or underdose area can be appeared in the junction area. This study researched therapy technique which can give uniform dose at skin junction owing to applying the edge block of lateral field at head and neck cancer. We measured the changed distance and rotational angle between central line of anterior supraclavicle lymph node and low margin of right lateral field on simulation process using the shielding block of variable rotation. As a result, the changed distance between central line of anterior supraclavicle lymph node and low margin of right lateral field was below 2mm to 10cm distance at central line of Y axis, changed angle was average 1.28 degree. But by using it the shielding block of variable rotation, the incorrect match at junction can be minimized. We think that this technique is very efficient one to apply this technique at head and neck cancered by the movement of organs can be not included, Therefore we have to pay attention on the process to imput MLC layer
    11/2008; 8(11). DOI:10.5392/JKCA.2008.8.11.235
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    ABSTRACT: When the whole neuraxis is irradiated, as in medulloblastoma, the large target volume makes field arrangement complicated and 3-4 adjacent fields have to be used. A calculation method, based on geometrical matching of field edges, is presented for determining optimal separation between the opposed cranial fields and the posterior spinal field as orthogonal movements of the treatment couch top. The dosimetric verification of the method with a 4 MV photon beam indicates a dose inhomogeneity below +/- 7%.
    Acta Oncologica 02/1994; 33(6):661-5. DOI:10.3109/02841869409121779 · 3.71 Impact Factor
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    ABSTRACT: The digital display of the simulator couch position is an often under utilized accessory. This function can be very helpful in determining patient separation and posterior source-to-skin distance (SSD) and also in the setting up of abutting and preplanned ports. Examples are presented to show the practical application for routine simulations.
    Medical Dosimetry 12/1997; 22(4):299-303. DOI:10.1016/S0958-3947(97)00103-9 · 0.95 Impact Factor