Radiotherapy with Cutting Field IMRT (CFIMRT) 

To achieve the dose distribution corresponding to that in IMRT using a conventional irradiation method, we propose the combination of rectangular rotation irradiation and fixed multiport irradiation (cutting field IMRT). In this site, I will demonstrate several clinical cases and these 'templates'.

No smallsegments are used for planning by CFIMRT. So this method is different from 'conventional IMRT '. <Reference>

The information provided on this 'Cutting Field IMRT' website is designed to support, not replace, the relationship that exists between a patient/site visitor and his/her physician. This site provide technical guidance for medical professionals, but you must use these information by your responsibility. Cutting Field IMRT is one of techniques for radiation therapy. This site will provide its information for medical professionals. If you are not a medical specialist, please talk with health professionals when you use the informations of this site. (Medical guidelines and medical insurance system are different by countries and districts.)

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Sample cases planned without MLC(Multi-Leaf Collimater) (RTP arts) ->Refer to 'Intensity modulated field' QA & QC            

      Cutting Field Technology    Combination of Fixed port and Rotational port

(Low dose irradiation for large volume maybe induce radiation pneumonitis, so the public viewing of 'Lung session' will be suspended.)

For example: Dose-Dependent Pulmonary Toxicity After Postoperative Intensity-Modulated Radiotherapy for Malignant Pleural Mesothelioma. Int J Radiat Oncol Biol Phys. 2007

('The mean V(20) of the non-PRD patients was considerably lower than that accepted during standard thoracic radiotherapy, implying that the V(20) should be kept as low as possible after extrapleural pneumonectomy.')

Jang SY, Liu HH, Mohan R. Related Articles Underestimation of Low-Dose Radiation in Treatment Planning of Intensity-Modulated Radiotherapy. Int J Radiat Oncol Biol Phys. 2008

Shueng PW, Lin SC, Chang HT, et al. Toxicity risk of non-target organs at risk receiving low-dose radiation: case report. Radiat Oncol. 31;4(1):71., 2009 [Epub ahead of print]


Das IJ, Cheng CW, Chopra KL, et al. Intensity-Modulated Radiation Therapy Dose Prescription, Recording, and Delivery: Patterns of Variability Among Institutions and Treatment Planning Systems. J Natl Cancer Inst. 2008 Mar 5;100(5):300-7. Epub 2008 Feb 26.

In this article, several problems about IMRT are described. Please read its PDF file (free access)

'IMRT produces relatively greater dose inhomogeneity than 3D-CRT, even though it is theoretically supposed to provide a uniform dose.'

And also Compare inhomogeneityIMRT with CFIMRT: IMRT vs CFIMRT

PowerPoint files are stored to briefcase if you need detailed drawing images.->Yahoo BriefCase

Wole neck irradiation 'Prescribe=Delivery=50Gy version'

Whole Pelvic LN irradiation (50Gy) for Prostate cancer: CTV by RTOG

Whole Pelvic LN irradiation (50Gy) for Gynecological malignancy: CTV by RTOG

Anorectal cancer: CTV by RTOG

6 Ports plan (2 arc) for prostate

Whole neck 66Gy by dose painting (updated)

Whole neck 66Gy (Oropharynx)

GIF anime about MLC and Gantry moving of DMLC-IMRT ( Conventional IMRT ).

In comparison MLC doesn't move during irradiation at each directions and no subsegments are used in CFIMRT.

'Segments' and 'Intensity Map' of IMRT: GIF animation      (Segments are not used basically at CFIMRT)

What is Cutting Field IMRT (CFIMRT)    Advantage of CFIMRT

  Information of CRIMRT                      CFIMRT is easy to plan

 QA and QC                                     The contributed cases

Comparison of each irradiation method

Clinical application of TCP/NTCP

Sample plan with/without wedge filter

Intensity modulated field

Target movement during each IMRT sessions

Basic technology for irradiation About_Iso_dose_line



About each irradiation method Basic anatomy About 'Wedge fielter'


XiO operation explanation (including about 'remote planning')

Please be sure to perform actual dose measurement in each irradiation fields in CFIMRT. And please be sure to perform comparison with the measurement dose and the calculation dose in RTPs.

How do you think these 'incidents'? : IAEA PowerPoint file (Accident report)


last modification date: 2012/11/26