$B!!!!(J ANFH is well-recognized as a cause of acute and chronic hip pain. An early misdiagnosis might lead to the collapse of the femoral head in a few years.Therefore, early diagnosis is a critical point. the initial evaluation of ANFH should begin with plain radiographs. Plain films ,however, are of limited sensitivity for detecting early disease, which means evaluation of the early stage of ANFH is a difficult clinical problem.
$B!!!!(J The fundamental algorithm of this method was originally developed for digital chest radiographs.Two texture measurements, calculated from the root mean square(R.M.S.) variation and the first momentof the power spectrum, can detect and characterize lung disease.
$B!!!!(J However, several problems occure when we apply this to the quantity of the bone trabecular texture. That is why we have developed a new method to solve them.
$B!!!!(J Preliminary results indicated that the texture measurements (which are normalized by R.M.S.variations and the first moments of the power spectrum of femoral neck bone trabecular pattern) of abnormalfemoral heads with avascular necrosis diseases were strikingly different from these normal femoral heads.
$B!!!!(J Our results strongly suggest that quantitative texture measurements calculated from digital images may be useful to radiologists in the assessment of ANFH disease.
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fig. 1 $BBgB\9|F,2u;`>I$N#X@~IB4|J,N`(J
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1 $B;HMQ5!4o(J
- $B0J2<$K;HMQ5!4o$r<($9!#(J
- $B#X@~H/@8AuCV!'!!(JPHV-B-157($BF|N)!K(J
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- $B!!!J(JFig.$B#2!K$K@5>oBgB\9|F,#X@~A|$H!"=i4|(J(early stage)$B$NBeI=E*#A#N#F#H>INc$r<($9!#(J
fig. 2 $B!!BgB\9|F,#X@~A|(J
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- $B!!@5>oNc$O!"9xDK!J7ZEY$N%X%k%K%"!KEy$K5/0x$9$k$H9M$($i$l$?EBIt!?8T4X@aDKEy$G#X@~;#1F8!::$ro$rG'$a$i$l$:!"$=$N8e$b#A#N#F#H$NH/>IIBNr$,$J$/NW>2E*$KL@$i$+$K@5>o$HH=Dj$5$l$?@.?M45o%\%i%s%F%#%"$r4^$`!K$rA*Br$7$?!#(J
- $B!!<@45Nc$O!"(Jbiopsy$B=j8+!"=Q8e:YK&?G!"B>%b%@%j%F%#?GCG$N2?$l$+$N8!::7P0^$,$"$j!"Ev1!@07A302J$K$F#A#N#F#H$H$7$FIB4|?GCG$,3NDj$7$?#1#2Nc$rA*Br$7$?!#(J
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2 $BBgB\9|F,2u;`>I$K1w$1$k9|NB%F%/%9%A%c!<$NDjNL2r@O(J
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fig. 3 $BBgB\9|F,#X@~A|$K$*$1$k9|NB%F%/%9%A%c!<$NDjNLJ,@OK!(J
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fig. 4 $BBgB\9|F,2u;`>I$NJ*M}E*<\EY2r@OMQ$K@_Dj$7$?3F
- $B!!$7$+$7!"Kv4|(J(terminal stage)$B$GG'$a$i$l$k429|1138$NFse$GHf3SE*L@NF$K4Q;!2DG=$G$"$j!"K\2r@O$G$OBP>]30$H$7$?!#(J
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- $B!!\:Y$KJ,@O$5$l$k!#%F%/%9%A%c!<$NHy:YJQF0@.J,$N$_$rCj=P$9$k$?$a$K%P%C%/%0%i%s%IJd@5$*$h$S<~4|CGNv8m:9$NJd=~MQ%G!<%?%&%$%s%I=hM}$r9T$$!"#2
- $B!!8T4X@a;#1F$K$OA4$F;6Mp@~=|5nMQ#X@~%0%j%C%I$,;HMQ$5$l$?$,!"$3$N%9%Z%/%H%k@.J,$O%F%/%9%A%c!<2r@O$KBP$7$F;(2;$H$J$k$?$a<~GH?t%U%#%k%?$K$F_I2a$7$?!#99$K;k3P7O$N%l%9%]%s%94X?t$rMQ$$$F%U%#%k%?%j%s%0$7$?!#(J
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fig. 5 $BBgB\9|F,#X@~A|$N%Q%o!<%9%Z%/%H%k(J
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fig. 6 $B#X@~%0%j%C%I@.J,$NCj=P!J=|5n!KMQ<~GH?t%U%#%k%?$H!"$=$N=hM}2hA|(J
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fig. 7 $BBgB\9|F,2u;`>I#X@~2hA|$N<~GH?t2r@O(J
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fig. 8 $BBgB\9|F,ptIt$N(J texture measure
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fig. 9 $BBgB\9|F,2u;`>I$NIBJQ>pJs$NCj=P(J
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$B!!(JMaryellen L.Giger$B=u65p$K46pG.$K7II~$9$k$H6&$K!"$3$3$K?
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