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A STUDY ON MAGNETIC RESONANCE IMAGING OF THE TEMPOROMANDIBULAR JOINT

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Abstract

ÀúÀÚ´Â ÇöÀç È°¹ßÇÏ°Ô ¿¬±¸µÇ°í ÀÖ´Â ÀÚ±â°ø¸í ¿µ»óÀ» ¾ò´Âµ¥, ¼±ÇеéÀÇ °íÁÖÆÄ ÆÞ½º ¹Ý
º¹ ¹æ½Ä°ú´Â ´Ù¸¥ MPGR(Multi-Planar Gradient Recalled), GRASS (Gradient Recalled
Acquisition in the steady State ¹× CSMEMP (Contiguous Slice Multiple Echo,
Multi-Planar)¸¦ ÀÌ¿ëÇÏ¿©, ¾Ç°ûÀý¿¡ ´ëÇØ ¾î¶°ÇÑ Áõ»óÀ̳ª ¡ÈÄ°¡ ¾ø´Â 5¸íÀÇ ³¹ÀÚ¸¦ ´ë»ó
À¸·Î ½Ã»ó»ç¸é ¹× °ü»ó»ç¸é ¿µ»óÀ» ¾ð¾î ¼±ÇеéÀÇ °íÁÖÆÄ ÆÞ½º ¹Ýº¹ ¹æ½Ä ¹× ´Ü¸é»ó°ú ºñ±³
ºÐ¼®ÇÏ¿© ´ÙÀ½°ú °°Àº °á°ú¸¦ ¾ò¾ú´Ù.
1 ¾Ç°üÀýÀÇ Àڱ⠰ø¸í ¿µ»óÀ» ¾ò±â À§ÇÑ ÃÖÀûÀÇ ¹Ýº¹½Ã°£(TR)°ú ¿¡Äڽð£(TE)Àº ´ÙÀ½°ú
°°´Ù.
°¡. Spin Echo ¹æ½Ä¿¡¼­´Â ¹Ýº¹½Ã°£500 msec ¿¡Äڽð£ 20msecÀ̾ú´Ù.
³ª. MPGR ¹æ½Ä¿¡¼­ÀÇ ¹Ýº¹½Ã°£ 400msec, ¿¡Äڽð£ 18msecÀ̾ú´Ù
´Ù. GRASS ¹æ½Ä¿¡¼­´Â ¹Ýº¹½Ã°£ 40msec, ¿¡Äڽð£ 12msecÀ̾ú´Ù
¶ó. CSMEMP ¹æ½Ä¿¡¼­´Â ¹Ýº¹½Ã°£ 700msec, ¿¡Äڽð£ 30msecÀ̾ú´Ù
2. MPGR ¹æ½ÄÀ» »ç¿ë½Ã ¾ÆÁÖ ÂªÀº ½Ã°£³» T2-°­Á¶ ¿µ»óÀ» ¾òÀ» ¼ö ÀÖ¾ú´Ù
3. GRASS ¹æ½ÄÀ» ÀÌ¿ëÇÑ °ü»ó»ç¸éÀÇ ¿µ»óÀº, ÁßÁ¤µµÀÇ ¿¡³ÊÁö ½ÅÈ£ °­µµ¸¦ º¸¿© ȸ¹é»ö
À¸·Î ³ªÅ¸³­ °üÀý¿øÆÇÀÇ Àü³», ÈÄ ¿ÜÃø ºÎÂøºÎ ¹× °üÀý¿øÆÇÀ» ¸íÈ®È÷ º¼ ¼ö ÀÖ¾ú´Ù.
4. Spin Echo ¹æ½Ä°ú CSMEMP ¹æ½ÄÀº µ¿ÀÏÇÑ ¿¡³ÊÁö ½Å°í °­µµ¸¦ º¸¿´À¸³ª CSMEMP
¹æ½ÄÀ» ÀÌ¿ëÇÑ ¿µ»óÀº Spin Echo ¹æ½Äº¸´Ù ´Ù¼Ò ÇØ»ó·ÂÀÌ ÀúÇϵǾú´Ù.

Examinations of the temporomandibular joints were performed on a 1.5 Tesla magnetic
resonance (MR) system. An MR surface receiver coil 3 inch in diameter was placed on
plastic frame, the patient's head being placed in the frame so that the coil was pressed
against the temporal region.
In taking advantage of the magnetic resonance imaging that has been studied briskly
till now, author obtained the images of parasagittal and paracoronal planes about the
temporomandibular joint by using MPGR (Multi-Planar Gradient Recalled), GRASS
(Gradient Recalled Acquisition in the Steady State), and CSMEMP (Contiguous Slice
Multiple Echo, Multi - Planar), that differ from the Spin Echo pulse sequence which the
previous authors used.
Five subjects with no symptoms of temporomandibular joint pain and dysfunction
were studied. The plane images obtained by these methods were compared with those
by Spin Echo pulse sequence.
The results were as follows :
1 The optimal repetition times (TR) and echo times (TE) for T.M.J. image were;
a. 400 msec and 18 msec in PMGR pulse sequence.
b. 40 msec and 12 msec in GRASS pulse sequence.
c. 700 msec and 30 msec in CSMEMP pulse sequence.
d.500 msec and 20 msec in Spin Echo pulse sequence.
6 When the MPGR pulse sequence was using,72-weighted image was obtained in very
short time.
3. On the image of the paracoronal plane by GRASS pulse sequence, meniscus showed
the moderate signal intensity, and the meniscus and its anteromedial, posterolateral
attachments were observed definitely with gray color.
4. The signal intensity of Spin Echo pulse sequence was equal to that of CSMEMP
pulse sequence, but the image by CSMEMP pulse sequence showed relatively lower
level in its resolution.

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