33
健康話題
Excessive Use of CT Scans: Harmful to Health
Although computed tomographies (CTs) are very useful, it’s use may have been excessive, eg, 1243 patients at Hospitals in Florida
and Washington, DC, got a median of 45 mSv [units of radiation exposure] of radiation over 5 years: comparing unfavorably with
chest X-rays of only 0.02 mSv each. Dr Brenner of the Columbia University Medical Center also found 1/3 of all CTs in the US were
unnecessary: partly because of inadequate patient doctor communication, let alone the practice of defensive medicine (to avoid being
blamed for missed pathologies). Based on research on 25,000 Japanese post-atomic-bomb survivors exposed to an estimated similar
amount of radiation as 2 CT scans, the US FDA estimated the lifetime risk of developing radiation-induced cancers from the current
practice of CT scanning is roughly 0.05%. For kids the risk is higher, at 0.2%. Clinicians must balance the risks vs the benefits;
patients to avoid requesting CTs: not even when all scanning expenses are well covered. If CTs are mandatory, the use of “low-dose”
CTs should always be considered whenever feasible; use lead aprons to cover all sensitive areas, especially the foetus. Above all, as
the red light indicates X-rays being turned on, never make any attempt whatsoever to enter the room.
ϓ࠴ᄣ̋ٙટաኒඎdԴٙ
ࡈ
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ٙᏐ͜dவɓतࣿɛ໊࿁׳࢛ᇞᅂᚤٙઽช
ܓ
݊
ϓɛٙ
10
࠴εdɾ܀ˢӲ܀һઽชfவԴɛ
ࡁ
࿁
CT
ધ݊щঐᄣ̋ᐖस೯षଟٙዄᅊɰʔᓙٙ
ᄣ̋dॸ
ن
̬ৎfᒱ್
ɓϣ
CT
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ߧ
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ɛઃɪᐖसٙଟʔ
ɽdШ
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ݟ
ഗʮੰ੭ԸٙΚ
ʔׁ࢙ൖf
怎樣防止濫用CT檢
查?
CT
Ꮸ
ݟ
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dΪϤ
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CT
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f
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CT
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ᇍఖձൢᓙतମϞɓ֛ٙ҅ࠢdԨ
ڢ
ຬঐfν
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X
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CT
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ج
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ݟ
Ъਿ͉̌dਂՑɓʲ
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əषɛdટൢձஈଣषɛ
ࣛdʔ
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ա̮
ޢ
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ᘌࣸ
CT
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सf
ઃ٫ʔ
ࠅ
Ϊ
ط
षːʲdׁൖ੬ൢᐕҦஔdٛͦ
Ӌ৷อҦஔᏨ
ݟ
dһʔ
ࠅ
Ϊʈෆձʮ൬ᔼᐕdʔც
ࠅ
Іʉ໐̍dϾ੶Б
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CT
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ࠅ
˸
X
ᇞ࿁Ԓ
ٙෆԸᐏːଣɪ
ٙတԑdʔᎵ̰f
那麽,CT檢查有哪些
需要注意的細節呢?
ڡ
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C T
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ä
2
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աЗdतй݊໗eً͠໗ഃ࿁
X
࢛ᇞˀᏐઽชٙЗආБԣᚐd߈Ꮦԣᚐண௪dί
ટաᏨ
ݟ
̙ࣛ˴ਗΣᔼ͛̈f
׳࢛Ꮸ
ݟ
ࣛd׳࢛܃
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ɪٙᙆѓܸͪዱึ
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dϤࣛ
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ൢ٫dɓ
ܛ
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ژ
̮ഃ
ࡉ
dʔ
ࠅ
ίᏨ
܃ݟ
lzഃ
שࡉ
˪fઃ٫ӚϞतйც
ࠅ
ᚐٙઋ
ر
ɨd᙮ʔ
ࠅ
ආɝᏨ
܃ݟ
lzΝd˸ಯˇʔ̀
ࠅ
ٙ፧࢛f