{'fraction_non_alphanumeric': 0.029043280182232345, 'fraction_numerical': 0.01366742596810934, 'mean_word_length': 5.058620689655172, 'pattern_counts': {'":': 0, '<': 1, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Chapter 6 The eff ect of e-learning on the quality of cervical length measurements

Objective: Training in ultrasonography is frequently performed hands-on along with an experienced sonographer. With the introduction of cervical length (CL) measurement in a research setting, a CL measurement e-learning module (CLEM) was developed with the purpose to enhance the knowledge and skills of experienced ultrasonographers. CLEM was designed especially for ultrasonographers who perform ultrasound in a general obstetrical practice, but do not regularly perform CL measurements. In this case-control study we assess the effect of CLEM on the quality of cervical length measurements comparing CLEM trained and non-CLEM trained ultrasonographers. Methods: The CLEM consists of five theoretical questions and three caliper placing tests to acquire the cervical length measurement technique. The quality of the CL measurements of CLEM participants was compared to images of non-participants using a CL measurement image score (CIS) defined as the sum of six items which assess the quality of the image. Each CLEM participant submitted five cervical length images. The images of non-CLEM participants were randomly selected from an ultrasound database. Results: The CL image score of the CLEM participants (n= 61) was significantly higher than the CIS of non-CLEM participants (n= 23, 164.9 vs. 155.6 respectively, p = 0.03). Visibility of the internal os and positioning of the calipers on internal and external os was found to have a significantly higher CIS score in the CLEM participants compared to non-CLEM participants (p = 0.001 and p <0.001). Conclusion: The CLEM might improve the quality of CL measurements performed by trained and untrained sonographers.