The two types of correction of absorbed dose estimates for internal emitters.

Abstract:

BACKGROUND:Two types of correction for absorbed dose (D) estimates are described for clinical applications of internal emitters. The first is appropriate for legal and scientific reasons involving phantom-based estimates; the second is patient-specific and primarily intended for radioimmunotherapy (RIT). METHODS:The Medical Internal Radiation Dose (MIRD) relationship (D) = S A is used, where S is a geometric matrix factor and A is the integral of source organ activities. Internal consistency of the data and the size of organ systems in the humanoid phantom must be assured in both types of estimation. RESULTS:The first dose estimate correction (I) is one whereby computations refer to one or another standard (e.g., MIRD-type) phantom. In this case the S value remains as given, but the measured patient A data must be standardized. The correction factor is the phantom's ratio of organ mass to whole-body mass divided by the same ratio for the volunteer or patient. The second dose estimate correction (II) is patient-specific. While the A value is unchanged for this application, a correction term is provided for the phantom-derived S matrix. The dominant (nonpenetrating radiation) component of this correction factor can be obtained via the ratio of the patient to phantom organ masses. In both corrections, we recommend that true organ sizes, necessary in each method of estimation, be determined in a separate sequence of anatomic images. CONCLUSIONS:In both dose estimation corrections, true sizes of the patient's or volunteer's internal organs must be obtained. Correction due to organ mass size can be severalfold and is probably the dominant uncertainty in the internal emitter absorbed dose calculation process.

journal_name

Cancer

journal_title

Cancer

authors

Williams LE,Liu A,Yamauchi DM,Lopatin G,Raubitschek AA,Wong JY

doi

10.1002/cncr.10290

subject

Has Abstract

pub_date

2002-02-15 00:00:00

pages

1231-4

issue

4 Suppl

eissn

0008-543X

issn

1097-0142

pii

10.1002/cncr.10290

journal_volume

94

pub_type

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