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(BQ) Part 2 book "Echocardiography pocket guide - The transthoracic examination" presents the following contents: The transthoracic echocardiography examination (left parasternal views, apical views, subcostal views, suprasternal notch views,.) reference guide. | The Transthoracic Echocardiography Examination Orientation Maneuvers and the Examination Protocol TRANSDUCER SCAN PLANE INDEX MARK AND SCAN SECTOR IMAGE DISPLAY The geometric ultrasound beam or sector scan is generated by rapid sweeps of the ultrasound beam of the phased array transducer through the region of interest or anatomical scan plane as illustrated earlier in Figures 3.6 3.11 and 3.12 . Conceptually the ultrasound beam therefore is a pie-shaped beam as shown in Figure 5.1a . Note the position of the index mark a guide to transducer beam orientation during the examination. The index mark may be a palpable ridge or a depression with or without light to aid transducer orientation in a dimly lit room. By convention the index mark indicates the part of the image plane that appears on the right side of the image display Figure 5.1b . Figure 5.1a Transducer scan plane and index .