A system for intracavitary tissue measurement and monitoring, the system comprising: an introducer device (102, 102', 102", 102''', 502, 502', 602) configured to be positioned adjacent to an intracavitary tissue, the introducer device comprising: a catheter shaft (104, 104', 104", 104''', 504, 504', 604) having a distal end (106, 106'''), a longitudinal axis, and a lumen extending therethrough, the catheter shaft having an opening (108, 108', 108", 108''', 508, 508', 608) at the distal end along the longitudinal axis such that at least a portion of the lumen is exposed; and a circuit board (110, 110', 110", 110''', 510, 510', 610) having an array of infrared sensors (112, 112', 112", 112''', 512, 512') disposed thereon, the circuit board disposed within the lumen of the catheter shaft proximal to the opening at the distal end, the array of infrared sensors having circuitry configured to generate a signal indicative of temperature of the intracavitary tissue; and an expandable structure (114, 115, 117); and a non-transitory computer readable media having instructions stored thereon, wherein the instructions, when executed by a processor operatively coupled to the circuit board, cause a graphical user interface to display information indicative of temperature of the intracavitary tissue based on the signal from the array of infrared sensors, characterized in that: the expandable structure is formed from an infrared transmissive material and disposed on the distal end of the catheter shaft to surround the array of infrared sensors and to provide a field of view through the opening. an introducer device (102, 102', 102", 102''', 502, 502', 602) configured to be positioned adjacent to an intracavitary tissue, the introducer device comprising: a catheter shaft (104, 104', 104", 104''', 504, 504', 604) having a distal end (106, 106'''), a longitudinal axis, and a lumen extending therethrough, the catheter shaft having an opening (108, 108', 108", 108''', 508, 508', 608) at the distal end along the longitudinal axis such that at least a portion of the lumen is exposed; and a circuit board (110, 110', 110", 110''', 510, 510', 610) having an array of infrared sensors (112, 112', 112", 112''', 512, 512') disposed thereon, the circuit board disposed within the lumen of the catheter shaft proximal to the opening at the distal end, the array of infrared sensors having circuitry configured to generate a signal indicative of temperature of the intracavitary tissue; and an expandable structure (114, 115, 117); and a catheter shaft (104, 104', 104", 104''', 504, 504', 604) having a distal end (106, 106'''), a longitudinal axis, and a lumen extending therethrough, the catheter shaft having an opening (108, 108', 108", 108''', 508, 508', 608) at the distal end along the longitudinal axis such that at least a portion of the lumen is exposed; and a circuit board (110, 110', 110", 110''', 510, 510', 610) having an array of infrared sensors (112, 112', 112", 112''', 512, 512') disposed thereon, the circuit board disposed within the lumen of the catheter shaft proximal to the opening at the distal end, the array of infrared sensors having circuitry configured to generate a signal indicative of temperature of the intracavitary tissue; and an expandable structure (114, 115, 117); and a non-transitory computer readable media having instructions stored thereon, wherein the instructions, when executed by a processor operatively coupled to the circuit board, cause a graphical user interface to display information indicative of temperature of the intracavitary tissue based on the signal from the array of infrared sensors, characterized in that: the expandable structure is formed from an infrared transmissive material and disposed on the distal end of the catheter shaft to surround the array of infrared sensors and to provide a field of view through the opening.