Iridium 192 nomogram system for single plane implants

Journal Article · Sat Feb 01 00:00:00 EST 1986 · Int. J. Radiat. Oncol., Biol. Phys.; (United States)

DOI:https://doi.org/10.1016/0360-3016(86)90108-2· OSTI ID:5739661

Murphy, Jr, D J; Memula, N; Doss, L L

Nomograms for square planar arrays spanning the range from 3 X 3 cm to 10 X 10 cm were developed. The nomograms are intended to be used for pretreatment planning of implant geometry, so that the therapist may enter the operating room with a plan for the optimal implant in mind. We show that clinically useful implants are those in which the reference isodoses are fully coupled. Decoupling occurs when ribbon spacing exceeds approximately 1.2 cm and leads to undesirable ''cold spots'' within the treatment volume. Ribbon spacing of 1.0 cm is recommended. This represents a trade-off between adequate ribbon coupling and minimum tissue damage from trocar placement. For clinically useful arrays, the area enclosed by the reference isodose contour (85% of the maximum dose rate) is approximately 50% of the array area. Reference isodose contour and its enclosed area are independent of seed strength for a given array, as long as all seeds within the array are of equal strength.

• Research Organization: Univ. of New Mexico Cancer Center, Albuquerque
• OSTI ID: 5739661
• Journal Information: Int. J. Radiat. Oncol., Biol. Phys.; (United States), Vol. 2
• Country of Publication: United States
• Language: English

Related Subjects

62 RADIOLOGY AND NUCLEAR MEDICINE
IRIDIUM 192
RADIATION SOURCE IMPLANTS
NOMOGRAMS
ISODOSE CURVES
NEOPLASMS
PLANNING
RADIOTHERAPY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
DAYS LIVING RADIOISOTOPES
DIAGRAMS
DISEASES
ELECTRON CAPTURE RADIOISOTOPES
HEAVY NUCLEI
IMPLANTS
INTERNAL CONVERSION RADIOISOTOPES
IRIDIUM ISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MEDICINE
MINUTES LIVING RADIOISOTOPES
NUCLEAR MEDICINE
NUCLEI
ODD-ODD NUCLEI
RADIATION SOURCES
RADIOISOTOPES
RADIOLOGY
THERAPY
YEARS LIVING RADIOISOTOPES
550604* - Medicine- Unsealed Radionuclides in Therapy- (1980-)