Exhibit 23.1
 Consent of Independent Registered Public Accounting Firm
  (1)
    
    Registration Statement (Form S-8 No. 33-54394) pertaining to the Input/Output, Inc.
Amended 1990 Stock Option Plan and Amended and Restated 1991 Outside Directors Stock
Option Plan,(2)
    
    Registration Statement (Form S-8 No. 33-46386) pertaining to the Input/Output, Inc.
1990 Restricted Stock Plan, 1990 Stock Option Plan and 1991 Directors Stock Option Plan,(3)
    
    Registration Statement (Form S-8 No. 33-85304) pertaining to the Input/Output, Inc.
Amended 1990 Stock Option Plan and the Input/Output, Inc. Amended and Restated 1991
Outside Directors Stock Option Plan,(4)
    
    Registration Statement (Form S-8 No. 333-14231) pertaining to the Input/Output, Inc.
1996 Non-Employee Director Stock Option Plan,(5)
    
    Registration Statement (Form S-8 No. 333-24125) pertaining to the Input/Output, Inc.
Employee Stock Purchase Plan,(6)
    
    Registration Statement (Form S-8 No. 333-80297) pertaining to the Input/Output, Inc.
1998 Restricted Stock Plan,(7)
    
    Registration Statement (Form S-8 No. 333-80299) pertaining to the Input/Output, Inc.
Amended and Restated 1990 Stock Option Plan and the Input/Output, Inc. Amended and
Restated 1996 Non-Employee Director Stock Option Plan,(8)
    
    Registration Statement (Form S-8 No. 333-36264) pertaining to the Input/Output, Inc.
2000 Restricted Stock Plan,(9)
    
    Registration Statement (Form S-8 No. 333-49382) pertaining to the Input/Output, Inc.
2000 Long-Term Incentive Plan,(10)
    
    Registration Statement (Form S-8 No. 333-60950) pertaining to the Input/Output, Inc.
Non-Employee Directors Retainer Plan,(11)
    
    Registration Statement (Form S-8 No. 333-112677) pertaining to the Input/Output, Inc.
2003 Employee Stock Option Plan,(12)
    
    Registration Statement (Form S-8 No. 333-116355) pertaining to the GX Technology
Corporation Employee Stock Option Plan,(13)
    
    Registration Statement (Form S-8 No. 333-117716) pertaining to the Input/Output, Inc.
Concept Systems Employment Inducement Stock Option Program,(14)
    
    Registration Statement (Form S-8 No. 333-123831) pertaining to the Input/Output, Inc.
GX Technology Corp. Employment Inducement Stock Option Program and the Input/Output, Inc.
April 2005 Inducement Equity Program,(15)
    
    Registration Statement (Form S-8 No. 333-125655) pertaining to the Input/Output, Inc.
2004 Long-Term Incentive Plan,




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(16)
    
    Registration Statement (Form S-8 No. 333-135775) pertaining to the Input/Output, Inc.
Second Amended and Restated Input/Output, Inc. 2004 Long-Term Incentive Plan,(17)
    
    Registration Statement (Form S-3 No. 333-112263) of Input/Output, Inc.,(18)
    
    Registration Statement (Form S-3 No. 333-115345) of Input/Output, Inc.,(19)
    
    Registration Statement (Form S-3 No. 333-123632) of Input/Output, Inc.,(20)
    
    Registration Statement (Form S-8 No. 333-145274) pertaining to the Third Amended and
Restated Input/Output, Inc. 2004 Long-Term Incentive Plan, and(21)
    
    Registration Statement (Form S-3 No. 333-148235) of ION Geophysical Corporation,(22)
    
    Registration Statement (Form S-3 No. 333-149458) of ION Geophysical Corporation,(23)
    
    Registration Statement (Form S-8 No. 333-155378) pertaining to the Fourth Amended and
Restated 2004 Long-Term Incentive Plan and the ARAM Systems Employee Inducement Stop
Options Program,(24)
    
    Registration Statement (Form S-3 No. 333-155387) of ION Geophysical Corporation,(25)
    
    Registration Statement (Form S-3 No. 333-156362) of ION Geophysical Corporation,(26)
    
    Registration Statement (Form S-3 No. 333-156363) of ION Geophysical Corporation,(27)
    
    Registration Statement (Form S-3 No. 333-159898) of ION Geophysical Corporation, and(28)
    
    Registration Statement (Form S-8 No. 333-167943) pertaining to the Fifth Amended and
Restated 2004 Long-Term Incentive Plan and the ION Geophysical Corporation Employee Stock
Purchase Plan,