Anxiety in Patients Undergoing MR Imaging

Anxiety in Patients Undergoing MR Imaging

294 Medical Dosimetry ALOPECIAASSOCIATEDWITH UNEXPECTED LEAKAGE FROM ELECTRON CONE B-Chen Wen, M.D., Edward C. Pennington, M.S., David H. Hussey, M...

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294

Medical Dosimetry

ALOPECIAASSOCIATEDWITH UNEXPECTED LEAKAGE FROM ELECTRON CONE B-Chen Wen, M.D., Edward C. Pennington, M.S., David H. Hussey, M.D., and Shirish K. Jani, Ph.D. Division of Radiation Oncology Department of Radiology, University of Iowa College of Medicine, Iowa City, IA International Journal of Radiation Oncology, Biology, Physics, Vol. 16, June 1989, pp. 1637-1641 This article presents a case in which a patient received an excessive dose of radiation due to unexpected leakage while receiving electron beam therapy. The patient experienced alopecia to the posterior region of his scalp while receiving electron treatments for a lesion on his shoulder. This was caused by excessive scatter and leakage along the side of the electron cone.

PREVENTIONOF ORAL MUCOSITIS IN RADIATION THERAPY: A CONTROLLEDSTUDY WITH BENZYDAMINEHYDROCHLORIDERINSE Joel B. Epstein, D.M.D., M.S.D., Peter Stevenson-Moore, B.D.S., M.S.D., M.R.C.D.(C), Stewart Jackson, M.D., F.F.R., F.R.C.P(C), Jemal H. Mohamed, B.Sc., M.Sc., and John J. Spinelli, B.Sc., M.Sc. Cancer Control Agency of British Columbia, Vancouver, B.C., Canada International Journal of Radiation Oncology, Biology, Physics, Vol. 16, June 1989, pp. 1571-1575 Mucositis is a predictable complication of the oropharyngeal region while receiving radiation therapy treatments. While radiation induced mucositis is a relatively short-term complication; it often may present the need for a change in the radiation treatment planning. The results of a study, which are presented, strongly suggest that with the use of Benzydamine hydrochloride rinse radiation induced oral mucositis can be prevented.

BETH YANKE ANXIETY IN PATIENTS UNDERGOING MR IMAGING Mark E. Quirk, Ed.D., Andrew J. Letendre, B.A., Robert A. Ciottone, Ph.D., and James F. Lingley, M.D. Department of Family and Community Medicine, University of Massachusetts Medical Center, Worcester, MA Department of Psychology, Clark University, Worcester and Worcester Memorial Hospital, Worcester, MA Radiology, 1989, Vol. 170, No. 2, pp 463-466 In view of the use of MR imaging in treatment planning, this article is worthwhile to help us understand and better prepare our patients for this study. Anxiety was studied in 46 patients who underwent MR studies. Anxiety was asso-

Volume 14, Number 4, 1989

ciated with the constrictive dimensions of the magnet bore, examination duration, coil noise, and temperature within the bore. Some of the strategies used by patients to cope with the examination are also reviewed.

TREATMENT PLANNING OF STEREOTACTICIMPLANTS FOR BRAIN TUMORS: SOME PRACTICALASPECTS Christos Kanelhtsas, Ph.D., Reinhard Gahbauer, M.D., Bradford B. Mullin, M.D., and Joseph Goodman, M.D. Divisions of Radiation Oncology and Neurosurgery, The Ohio State University College of Medicine, Columbus, OH Endocurietherapy/Hyperthermia Oncology 1989, Vol. 5, pp. l-7 Two practical aspects for the treatment planning and dosimetry of stereotactic implants for brain tumors are described. The first aspect explains the procedure used for placement of radioactive seeds in relation to tumor and skull. Using graphic 3-D reconstructions of CT’s or MR’s which represent the tumor volume and brain surface in a 3-D coordinate system, planning and implementation for the implant can be done without fiducials or a repeat preoperative or perioperative scans. Confirmation can be done using AP and Lat orthogonal films. The second aspect explores the effect of the catheter spacing on the dose distribution. A computer model of a cuboidal implant was designed. Various spacing of catheters were investigated and compared to their respective max dose, min dose, mean dose and target dose. Results and tables are given.

PAM NAPLACHOWSKI TREATMENTOF CANCER OF THE PANCREASBY INTRAOPERATIVEELECTRONBEAM THERAPY: PHYSICALAND BIOLOGICALASPECTS Farideh R. Bagne, Ph.D., J.D., Ralph R. Dobelbower, Jr., M.D., Ph.D., Andrews J. Milligan, Ph.D., and Donald G. Bronn, M.D., Ph.D. Department of Radiation Therapy, Medical College of Toledo, OH Internationa I Journal of Radiation Oncology, Biology, Physics, Vol. 16, No. 1, January 1989, pp. 231-242 Carcinoma of the pancreas has always had a dismal survival rate. Intraoperative electron beam therapy (IOEBT) is being used in an attempt to enhance local control of this disease and improve the patients survival by treating the exposed tumor to a high dose, single fraction of radiation while shielding the surrounding healthy organs. The radiobiology of large fractions and the physics and dosimetry of accurately delivering such a dose is the subject of this paper. The treatment facility at the Medical College of Ohio, the IOEBT apparatus, all the required dosimetric parameters and IOEBT procedure is presented. Emphasis is placed on the cooperation and coordination demanded ofall involved