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international commission on Radiation units and measurements ( ICRU).
1982      Picture archiving and communication system ( PACS) become available.
1983     The first grain film emulsion is developed.
1984      Laser stimulable phosphor for computed radiography appear.
1988      A superconducting quantum interference device for magneto encephalography ( MEG) is first used.
1989      The SI adopted by the NCRP and most scientific and medical societies.
1990      The Xeromammography system is produced.
1990      Helical CT is introduced.
1991     Twin slice CT is developed.
1992     The mammography quality standard Acts ( MQSA) is passed.
1996      Digital radiography that uses thin film transistor ( TFT) is developed.
1997     Charge coupled device ( CCD) digital radiography is introduced.
1997      Amorphous selenium flat panel image receptor is demonstrated by Rowlands.
1998    Multislice CT is introduced.
1998    Amorphous silicon CsI image receptor is demonstrated for digital radiography.
2000:    The first direct digital mammographic imaging system is made .
2002    Sixteen slice helical CT is introduced.
2002    Positrons emission tomography is introduced in routine clinical service.
2003    The Nobel in physiology or medicine is awarded to Paul Lauterbur and sir peter Mansfield for MRI.
2004     Sixtyfour slice helical CT is introduced.
2005     Dual source CT is announced ( Siemens)
2007    320 slice helical CT is introduced ( Toshiba).
2009    NCRP Report No. 160 ionizing radiation exposure of the population of the united states 2006 is published.

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