Unverified75% confidenceDecision RuleTime unknown
选购家用胎心仪认准超声探头频率2-3MHz范围，频率越低穿透越深适合孕晚期腹壁较厚孕妇，2MHz为常见配置
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75%
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Long-term
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Unverified家用多普勒胎心仪采用2MHz超声探头即可满足家用需求，探头频率越低（2MHz）穿透越深，比3MHz更适合孕中晚期腹壁较厚孕妇96% similarUnverified探头频率影响适用孕周：2MHz探头穿透深、适合孕中晚期腹部较厚孕妇；3MHz探头分辨率高但穿透浅，家用机型以2MHz为主流，选购时可确认参数95% similarUnverified家用远程胎监设备的多普勒超声探头频率应在1.0-2.0MHz之间，2.0MHz穿透力弱但对早孕胎心检测更敏感，1.0MHz适合孕晚期腹壁较厚孕妇，孕32周后建议选用带宽自适应的双频探头94% similarUnverified选购家用多普勒时优先选探头频率2MHz(而非3MHz)：2MHz穿透更深，孕早中期腹壁较厚或胎位偏深时更容易定位到胎心94% similarUnverified探头超声频率2MHz适合大部分孕妇（含较胖体质），3MHz穿透力较弱只适合偏瘦孕妇孕晚期，选购优先2MHz探头以兼顾各孕周和体型93% similar
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