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What is the difference between CT and MRI?

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People who want to study in free time 📚

What is the difference between CT and MRI?

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2025/12/7 Edited to

... Read moreCTとMRIの違いって、知識としては聞いたことがあっても、いざオーダーが出た瞬間に「患者さんにどう説明する?」「何を確認する?」で手が止まりがちでした。私が現場で助かった“超実務目線”の整理を置いておきます。 まず患者さんへの一言説明はテンプレ化するとラクです。CTは「放射線を使って短時間で体の断面を撮る検査」、MRIは「強い磁気と電波で、やわらかい組織を詳しく見る検査」。この2行が言えるだけで、説明の土台ができます。 次に、検査時間の目安。CTはだいたい5〜15分で終わることが多く、救急や出血の評価など“スピード重視”の場面で選ばれやすいです。MRIは20〜60分くらいかかることが多く、じっとしている時間が長いので、痛みが強い方や不穏リスクがある方は事前の声かけがかなり大事でした。 「MRIがうるさい・怖い」問題もよく聞かれます。私は検査前に「工事現場みたいな大きい音がするけど異常じゃないよ」「耳栓やヘッドホンがあるよ」「途中で呼び出しボタンで伝えられるよ」と伝えるようにしました。閉所恐怖がある方には、事前に“狭い筒の中に入る”ことを正直に説明して、必要なら医師へ相談(鎮静の検討など)につなげるとトラブルが減りました。 看護の確認ポイントも、私はチェックリストで覚えました。 ・CT(特に造影CT):腎機能(Creなど)、アレルギー歴、造影剤のリスク説明の理解。糖尿病薬を内服している方は休薬が絡むことがあるので、薬剤名の確認を早めに。 ・MRI:金属の有無が最重要。補聴器、入れ歯、ヘアピン、湿布、カイロ、磁気カードまで“持ち込みNG”が多いです。体内金属(ペースメーカーなど)は施設ルールが厳格なので、問診と申し送りを丁寧に。 頭部CTとMRIのざっくり使い分けも、学生さんがつまずきやすい所でした。超ざっくり言うと、CTは出血の評価が早くて強い、MRIは脳梗塞などの変化をより詳しく拾えることが多い、というイメージで覚えると臨床とつながりやすいです(もちろん病院の方針や撮像条件で変わります)。 最後に、患者さんが不安そうな時ほど「何分くらい」「どんな音・体勢」「途中でやめられる合図がある」を具体的に伝えると安心度が上がりました。忙しい時こそ、この3点セットだけでも先に伝えるのがおすすめです。

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