![]() ![]() A dose was then given to the more » pelvic wall using 4 cm or 5 cm midline blocks. A whole pelvic dose of 4000 rad was given for tumors smaller than 5 cm in size and 4500 rad for those larger than 5 cm. In a majority of patients, external irradiation was given with /sup 60/Co when AP diameter was less than 17 cm, and with a 46 MeV Brown-Boveri Betatron when AP diameter was greater than 17 cm. « lessīetween August 1968 and May 1976 at the Tufts-New England Medicl Center, 264 patients with carcinoma of the cervix on intact uteri were treated with external irradiation followed by one radium application. Doses to point B compare very favorably to those at point A. Afterloading with /sup 192/Ir is accomplished when the patient has returned to her room (after orthogonal radiography and computer dosimetry). The technique employs a template to guide the insertion into the parametria of a group of 18 gauge hollow steel needles transperineally. This helps to distribute the dose laterally, with relative sparing of bladder and rectum. We locate what is in essence a pair of paravaginal more » interstitial colpostats in both parametria in combination with the usual intrauterine tandem. In this paper, we describe a technique which largely eliminates the exposure problem and at the same time improves the homogeneity of pelvic endoradiotherapy. Waterman (and others) solved this dilemma by transvaginal radium implants many years ago however, despite good survival figures, this technique has not gained popularity, presumably because of excessive exposure to personnel. Poorly placed applicators fail to irradiate the pelvis homogeneously. In advanced carcinoma of the cervix the associated obliteration of the fornices or contracture of the vagina may interfere with accurate placement of conventional intracavitary applicators. 61 RADIATION PROTECTION AND DOSIMETRY BLADDER RADIATION DOSE DISTRIBUTIONS CARCINOMAS PELVIS RADIATION SOURCE IMPLANTS DOSIMETRY RECTUM INTERNAL IRRADIATION IRRADIATION CAPSULES ISODOSE CURVES PATIENTS PHANTOMS RADIOTHERAPY RADIUM UROGENITAL SYSTEM DISEASES ALKALINE EARTH METALS BODY BODY AREAS DIGESTIVE SYSTEM DISEASES ELEMENTS GASTROINTESTINAL TRACT IMPLANTS INTESTINES IRRADIATION LARGE INTESTINE MEDICINE METALS MOCKUP NEOPLASMS NUCLEAR MEDICINE ORGANS RADIATION SOURCES RADIOLOGY STRUCTURAL MODELS THERAPY URINARY TRACT 550604* - Medicine- Unsealed Radionuclides in Therapy- (1980-) 560161 - Radionuclide Effects, Kinetics, & Toxicology- Man 655003 - Medical Physics- =, number = , annual meeting of the American Society of therapeutic Radiologists, New Orleans, LA, USA, Country of Publication: United States Language: English Subject: 62 RADIOLOGY AND NUCLEAR MEDICINE 63 RADIATION, THERMAL, AND OTHER ENVIRON. (United States) Additional Journal Information: Journal Volume: 6:7 Conference: 21. of Maryland Hospital, Baltimore OSTI Identifier: 6758890 Resource Type: Conference Journal Name: Int. Results for a minimal implant to both proximal parametria and a clinical example of the parametrial implant application are also presented.Īuthors: Sewchand, W Prempree, T Patanaphan, V Bautro, N Scott, R M Publication Date: Tue Jul 01 00:00: Research Org.: Univ. There was a relatively minimal (8 to 13%) increase in the dose rates to other pelvic node-bearing sites. Our dosimetric results showed an increase in the parametrial and pelvic wall dose rates of better than 60% with a typical implant of six half-intensity (0.33 mg/cm) needles to the affected parametrium the bladder and rectum dose rates increased by less than 17%. ![]() The technique is used with patients who cannot accommodate two vaginal ovoids with the intrauterine tandem for conventional intracavitary radium therapy because of the extent of the neoplastic disease. The parametrial implant approach was instituted in our clinic in 1975 to minimize local failures, especially parametrial, in Stage IIIB carcinoma of the cervix. The results of direct dosimetry are presented. Radium needle implant to the parametrium in order to supplement the dose rates to the cervix, parametrium and pelvic wall from a protruding intrauterine tandem was simulated using the skeleton of an adult pelvis in a water phantom.
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