<prompt> CPD is best assessed byCT scanUltrasoundRadio pelvimetryPelvic assessment  <response>: Methods of assesment of Pelvis ClinicallyImaging studiesClinical Pelvimetry :Done manuallyCan be done beyond 37th week, better done after onset of labourFollowing are to be observed Sacrum Sacrosciatic notchIscial spines Side wallsPubic archPubic angleTransverse diameter of outletImaging :X-ray pelvimetry USGCT MRIX-ray pelvimetry : Limited value in diagnosisCan only assess size and shape of pelvis Useful in cases with pelvic fractures Disadvantage : Radiation exposure to both mother and foetus 885 miliradErect lateral view CT Easier to performRadiation exposure45-425miliradMore accurateMRIMore accurate to assess bony pelvisAssess pelvic capacity in different planesAssess foetal size and head volume, pelvic soft tissuesNo radiation riskExpensive,limited availability, more time takingUSG : Accurately measures the biparietal diameter 