Magnetic resonance imaging method for localizing discrete detail

Details Magnetic resonance imaging method for localizing discrete detail Magnetic resonance imaging method for localizing discrete detail

1994-04-15

1996-10-15

Smith, Ruth S.

Surgery

Truss

Pad

324307, 324309, A61B 5055

Patent

active

055644120

ABSTRACT:
In a medical resonance imaging method (NMR-tomography) the following program steps are executed in order to localize the position of a finite number e of discrete individual objects in a selected slice within a measuring object after recording of two slice selective projections in different directions: determining the position of the e individual objects based on the previously carried out recording steps; inquiring whether the localization of the e individual objects is unique; if yes, then ending the program execution; if no, then inquiring whether the number n of non-unique possibilities is smaller than a predetermined threshold value s; if yes, then carrying out a further program step with an encoding parameter which is changed with respect to all previously executed steps in accordance with a fixed predetermined scheme and subsequently returning to the first program step; if no, then calculating an encoding parameter which is suitable for resolving at least the majority of non-unique possibilities for the subsequent recording step, carrying out this recording step, and ending program execution.

REFERENCES:
patent: 4607222 (1986-08-01), Yokoyama et al.
patent: 4984160 (1991-01-01), Saint Felix et al.
patent: 5051698 (1991-09-01), Ordidge
Hausser, K. H. and Kalbitzer, H. R.: NMR Fur Mediziner und Biologen Springer Verlag, Berlin/Heidelberg, 1989, p. 143 ff.
Lauterbur, P. C.: Image Formation by Induced Local Inter-actions: Examples Employing Nuclear Magnetic Resonance. In Nature, vol. 242, Mar. 1973, pp. 190 ff.
Bottomley, Paul A.: NMR Imaging Techniques and Applications: A Review. In Rev. Sci. Instrum. vol. 53, No. 9, 1982 p. 131.

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