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Gynaecological UltrasoundGynaecological Ultrasound
Felipe Moretti, MD
Griff Jones, MD, FRCS
Assistant Professor – UOttawa
Maternal Fetal Medicine Division
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Basic physics
Gynaecology
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Ultrasound used for medical purposes is from one MHz (one million cycles per second) to 20 MHz.
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Higher frequency wave assesses the object more often in any given time period. This
results in more information and allows sharper images
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If each wave represents a path, the walker uses the same energy to reach point X. Low frequency waves penetrate
deeper into the tissues than high frequency waves
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SummarySummary
Low frequency sound waves can penetrate more deeply but have less definition than high frequency waves
The farther something is away from the probe, the worse the resolution
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In OB GYN Ultrasound – – We use low frequency probes for abdominal
scanning– We use high frequency probes for transvaginal
scanning
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Gyne UltrasoundGyne Ultrasound
Assess:
Uterine pathologies (ex. Fibroids);Endometrial pathologies (ex.polyps);Ovarian pathologies (cysts)
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UterusUterus
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Uterine PositionUterine Position
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Uterus TransvaginalUterus Transvaginal
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Uterine FibroidUterine Fibroid
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Uterine EnlargementUterine Enlargement
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Difficult FibroidsDifficult Fibroids
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Endometrium changesThroughout the cycle
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Anteverted uterus with follicular endometrium
Retroverted uterus with secretory endometrium
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Abnormal EndometriumAbnormal Endometrium
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Cavity EnlargementCavity Enlargement
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OvariesOvaries
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Trans-abdominal Ovarian ScanTrans-abdominal Ovarian Scan
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Transvaginal Ovarian ScanTransvaginal Ovarian Scan
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Depth of penetration was not an issue here. But the improved resolution due to the higher frequency of the TV probe shows ovarian substance and allows a
diagnosis of polycystic ovaries
Transabdominal Transvaginal
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Normal OvaryNormal Ovary
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Ovarian appearance changes throughout the menstrual cycle
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Cystic FollicleCystic Follicle
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Cyst ComplicationsCyst Complications
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resolved 2 weeks laterresolved 2 weeks later
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Ovarian MassesOvarian Masses
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Thank YouThank You