** Shares of 4DMedical 4DX.AX fall 20% to A$0.44, their lowest level since December 23, 2024

** Stock faces worst trading session since late June 2022, if current losses hold

** Medical tech firm receives firm commitments to raise A$5.5 million ($3.52 million) via a placement

** Placement issue price at A$0.425 per share, a 22.7% discount to stock's last close

** Co says funds to be used for commercialisation requirements

** More than 3.2 mln shares change hands, 4 times the 30-day avg volume

** Stock down 8.3% YTD, including current session's moves

($1 = 1.5623 Australian dollars)

(Reporting by Nikita Maria Jino in Bengaluru)

((Nikita.Jino@thomsonreuters.com;))