Given a text passage, come up with an appropriate title for it. The title should accurately represent what the main focus of the passage is. The title of a passage may be present in the first few sentences of the passage and/or be referred to multiple times in the passage. The title should be 1-5 words long.

Ex Input:
For medical purposes , X-ray filters are used to selectively attenuate , or block out , low - energy rays during x-ray imaging ( radiography ) . Low energy x-rays ( less than 30 keV ) contribute little to the resultant image as they are heavily absorbed by the patient 's soft tissues ( particularly the skin ) . Additionally , this absorption adds to the risk of stochastic ( e.g. cancer ) or non stochastic radiation effects ( e.g. tissue reactions ) in the patient . Thus , it is favorable to remove these low energy X-rays from the incident light beam . X-ray filtration may be inherent due to the X-ray tube and housing material itself or added from additional sheets of filter material . The minimum filtration used is usually 2.5 mm aluminium ( Al ) equivalent , although there is an increasing trend to use greater filtration . Manufacturers of modern fluoroscopy equipment utilize a system of adding a variable thickness of copper ( Cu ) filtration according to patient thickness . This typically ranges from 0.1 to 0.9 mm Cu .

Ex Output:
X-ray filter


Ex Input:
Me at the zoo is the first video that was uploaded to YouTube . It was uploaded on April 23 , 2005 at 20 : 27 : 12 PDT ( April 24 , 2005 at 3 : 27 : 12 UTC ) by the site 's co-founder Jawed Karim , with the username `` jawed '' and recorded by his high school friend Yakov Lapitsky .

Ex Output:
Me at the zoo


Ex Input:
`` When Love Takes Over '' is a song by French DJ - music producer David Guetta with vocals by Kelly Rowland from his fourth studio album , One Love . It was released as the lead single from the album on 21 April 2009 by Virgin Records ( EMI France ) . The song was conceived when Guetta played the instrumental version during one of his DJ sets in summer 2008 ; American recording artist Kelly Rowland , who fell in love with the track , convinced Guetta to allow her to take it so that she could write and record vocals for it . It was co-written by Nervo .

Ex Output:

When Love Takes Over