Dokter saya selalu menggunakan USG sebagai alat bantu.
Berikut saya kutipkan artikel yang saya dapat dari http://www.babycenter.com
Semoga bermanfaat
Asrita
> IS ULTRASOUND SAFE DURING PREGNANCY?
> The Number One Question.
> The Answer: YES!
> The following, is a quotation from the American Institute of Ultrasound in
> Medicine addressing this very question:
> AMERICAN INSTITUTE OF ULTRASOUND IN MEDICINE
> Official Statement
> Approved
> March 1993
> October 1982
> Diagnostic ultrasound has been in use since the late 1950s. Given its
> known benefits and recognized efficacy for medical diagnosis, including
> use during human pregnancy, the American Institute of Ultrasound in
> Medicine herein addresses the clinical safety of such use:
> No confirmed biological effects on patients or instrument operators caused
> by exposure at intensities typical of present diagnostic ultrasound
> instruments have ever been reported. Although the possibility exists that
> such biological effects may be identified in the future, current data
> indicate that the benefits to patients of the prudent use of diagnostic
> ultrasound outweigh the risks, if any, that may be present.
> The Bottom Line: as far as anyone can tell, and a lot of people have
> looked, ULTRASOUND IN PREGNANCY IS SAFE FOR BOTH THE MOTHER AND
> EMBRYO/FETUS.
> <<...>> <<...>> (TO TABLE OF CONTENTS)
> HOW DOES ULTRASOUND WORK?
> Basically, the ultrasound machine sends out a beam of sound for a really
> short period of time. Then it listens for echoes.
> Think about this example. You are in a big, empty room. You yell and then
> you listen. You hear an echo as the sound bounces off the walls. In other
> words, when you send out a sound beam (the yell) and then listen, you hear
> an echo. The further the wall is from you, the longer it takes for the
> echo to return to you. The closer the wall is to you, the sooner you hear
> the echo.
> The ultrasound machine does the same thing. And more. It uses the sound it
> hears to create the picture you see on the monitor. How?
> Every time it hears an echo from the sound beam it sent out, it places a
> dot (usually a shade of gray, ranging from black to white) on the monitor.
> The location of each dot depends on how long it takes the echo to reach
> the machine (i.e., how long the machine has to wait until it hears the
> echo). The shade of gray is determined by how strong (loud) the machine
> perceives the echo to be.
> Picture it this way. An echo from a wall with a hard, smooth surface will
> be louder than an echo from a wall with a soft, bumpy surface.
> Therefore, a strong echo from deep inside the mother will be whiter and
> farther from the top of the monitor screen. A weak echo from less deep
> inside the mother will be more gray and closer to the top of the monitor
> screen.
> The ultrasound machine sends out a sound beam and listens for echoes many
> times a minute in order to create the image on the screen.
> <<...>> <<...>> (TO TABLE OF CONTENTS)
> THE ULTRASOUND EQUIPMENT
> There are essentially three parts that are of practical interest:
> 1. The TRANSDUCER
> 2. The MONITOR
> 3. The MACHINE ITSELF
> THE TRANSDUCER -- This is the component the person performing the
> ultrasound examination holds in his/her hand. Within it is a crystal that
> emits the ultrasound beam and then "listens" for the echoes.
> The examiner moves the transducer to aim the ultrasound beam towards the
> area he/she wants to examine.
> THE MONITOR -- What every patient is most interested in. The monitor is a
> TV screen that displays the images created by the machine.
> THE MACHINE ITSELF -- This contains the computer power to transform the
> echoes the transducer "hears" into the images you and the examiner see on
> the monitor.
> <<...>> <<...>> (TO TABLE OF CONTENTS)
> HOW IS AN ULTRASOUND PERFORMED?
> In Obstetrics, there are two commonly employed methods for performing an
> ultrasound examination:
> 1. Transabdominal
> 2. Transvaginal (also called Endovaginal)
> The TRANSABDOMINAL method is the older of the two and the one with which
> most people are familiar. After applying gel or oil to the abdomen, the
> examiner moves the transducer on the belly in order to image the areas of
> interest.
> The reason gel or oil is applied first, is to help facilitate the
> transmission of the sound beam from the transducer to the skin.
> This examination is performed while the patient has an optimally filled
> bladder.
> The reason you need a properly filled bladder is because the ultrasound
> beam does not travel well through the gas in the intestines. The filled
> bladder helps move your intestines out of the way. That's why your doctor
> will request that you drink fluid before your examination and not go to
> the bathroom to empty out until he/she has had a chance to examine you.
> Incidentally, the reason I said "an optimally filled bladder" and "a
> properly filled bladder," but not a full bladder, is because, sometimes
> there can be too much fluid in the bladder and the examiner may ask you to
> empty some out.
> "Only some?" you must be thinking. Yes. This is called incremental voiding
> and it can make all the difference in the world between a great and a
> lousy scan. It may sound difficult, but, believe me, in my experience,
> thousands of women have done it with no difficulty at all. Although not
> all examiners believe in incremental voiding, I think it is one of the
> most important techniques used for performing high quality ultrasound
> examinations.
> TRANSVAGINAL ultrasound is generally performed with the bladder empty.
> This type of examination is performed with a specially designed ultrasound
> probe (transducer) that is placed in the vagina, just like a tampon. Most
> people find this method more comfortable than a transabdominal scan.
> With this method, the examiner can generally visualize structures more
> clearly and with greater resolution because he or she is looking a lot
> closer than by the transabdominal route. The only limitation to this
> approach is distance. For technical reasons, the ultrasound beam from the
> transvaginal probe does not travel as far into the body as the ultrasound
> beam from the transabdominal probe. Therefore, because the uterus has not
> enlarged very much, transvaginal sonography is usually confined to the
> first trimester, but may be useful later on in pregnancy.
> TRANSVAGINAL SONOGRAPHY IS ALSO CONSIDERED TO BE A SAFE PROCEDURE WITH NO
> HARMFUL EFFECTS TO EITHER THE MOTHER OR THE EMBRYO/FETUS.
> There is also a third technique used in Obstetrical (and Gynecological)
> ultrasound. This is the Transperineal approach. In essence, this can be
> considered as a cross between the endovaginal and transabdominal
> approaches. A transperineal scan is performed by placing the
> transabdominal probe against the skin just below the vulva. The probe is
> not inserted into the vagina. As with the transvaginal approach, the
> examination is generally performed with the bladder empty; however, an
> optimally distended bladder is not always an empty bladder. This type of
> scan is used to image the cervix. It can also be used to visualize
> structures inside the uterus which are close to the cervix. Transperineal
> scanning is a very useful technique when used in the proper circumstances.
>
> <<...>> <<...>>
> ----------
> From: Tini Sofyani[SMTP:[EMAIL PROTECTED]]
> Reply To: [EMAIL PROTECTED]
> Sent: Tuesday, June 29, 1999 2:35 PM
> To: '[EMAIL PROTECTED]'
> Subject: RE: [balita-anda] USG monitoring.
> Importance: High
>
> Saya mau berbagi pengalaman pribadi.
> Pada kehamilan saya yang lalu, saya mendapat pemeriksaan USG 2x, yaitu
> pada
> usia kehamilan 3 bulan & 6 bulan. Saya memang pernah membaca bahwa
> katanya
> pemeriksaan USG kurang baik kalau terlalu sering dilakukan. Tapi sampai
> sekarang tidak ada bukti bhw USG dapat mempengaruhi keadaan janin.
> Sekian saja info dari saya.
>
> Salam,
> Tini Sofyani
> Technology&Drilling Rumbai
> ph-42960, fax-44420
-deleted-
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