title: Use dose bricks concept to implement nasopharyngeal carcinoma treatment planning.
abstract: OBJECTIVE
  A "dose bricks" concept has been used to implement nasopharyngeal carcinoma treatment plan; this method specializes particularly in the case with bell shape nasopharyngeal carcinoma case.
  
  
  METHODS
  Five noncoplanar fields were used to accomplish the dose bricks technique treatment plan. These five fields include (a) right superior anterior oblique (RSAO), (b) left superior anterior oblique (LSAO), (c) right anterior oblique (RAO), (d) left anterior oblique (LAO), and (e) superior inferior vertex (SIV). Nondivergence collimator central axis planes were used to create different abutting field edge while normal organs were blocked by multileaf collimators in this technique.
  
  
  RESULTS
  The resulting 92% isodose curves encompassed the CTV, while maximum dose was about 115%. Approximately 50% volume of parotid glands obtained 10-15% of total dose and 50% volume of brain obtained less than 20% of total dose. Spinal cord receives only 5% from the scatter dose.
  
  
  CONCLUSIONS
  Compared with IMRT, the expenditure of planning time and costing, "dose bricks" may after all be accepted as an optional implementation in nasopharyngeal carcinoma conformal treatment plan; furthermore, this method also fits the need of other nonhead and neck lesions if organ sparing and noncoplanar technique can be executed.
authors: Department of Radiation Oncology, E-Da Hospital, Kaohsiung 82445, Taiwan ; Department of Medical Imagines and Radiological Science, I-Shou University, Kaohsiung 82445, Taiwan ; Medical Physics and Informatics Laboratory, Department of Electronics Engineering, National Kaohsiung University of Applied Sciences, 415 Chien Kung Road, Kaohsiung 80778, Taiwan.
authors: Jia-Ming
authors: JM
authors: Wu
authors: Department of Radiation Oncology, E-Da Hospital, Kaohsiung 82445, Taiwan ; Department of Urology, E-Da Hospital, Kaohsiung 82445, Taiwan.
authors: Tsan-Jung
authors: TJ
authors: Yu
authors: Department of Radiation Oncology, E-Da Hospital, Kaohsiung 82445, Taiwan ; Department of Medical Imagines and Radiological Science, I-Shou University, Kaohsiung 82445, Taiwan ; Medical Physics and Informatics Laboratory, Department of Electronics Engineering, National Kaohsiung University of Applied Sciences, 415 Chien Kung Road, Kaohsiung 80778, Taiwan.
authors: Shyh-An
authors: SA
authors: Yeh
authors: Medical Physics and Informatics Laboratory, Department of Electronics Engineering, National Kaohsiung University of Applied Sciences, 415 Chien Kung Road, Kaohsiung 80778, Taiwan ; Department of Radiation Oncology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung 833, Taiwan.
authors: Pei-Ju
authors: PJ
authors: Chao
authors: Department of Radiation Oncology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung 833, Taiwan.
authors: Chih-Jou
authors: CJ
authors: Huang
authors: Medical Physics and Informatics Laboratory, Department of Electronics Engineering, National Kaohsiung University of Applied Sciences, 415 Chien Kung Road, Kaohsiung 80778, Taiwan.
authors: Tsair-Fwu
authors: 0000-0002-3112-3594
authors: TF
authors: Lee
mesh_terms: D024221:Antineoplastic Protocols; D002277:Carcinoma; D003131:Combined Modality Therapy / Q000379:methods; D005260:Female; D006801:Humans; D000077274:Nasopharyngeal Carcinoma; D009303:Nasopharyngeal Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology*; D010347:Patient Care Planning; D011877:Radionuclide Imaging; D011879:Radiotherapy Dosage