IMI of Arlington S-4/A Registration of securities issued in business combination transactions (amended)

EXHIBIT 12.1

COMPUTATION OF EARNINGS TO FIXED CHARGES

			InSight (Predecessor)						Holdings
																														Pro forma
						Period															Pro forma			For the Three						for the
			Year			from															for Year			Months Ended						Three Months
			Ended			July 1 to			Years Ended June 30,												Ended			September 30,						Ended
			June 30,			October 17,															June 30,									September 30,
			2001			2001			2002			2003			2004			2005			2005			2004			2005			2005
Earnings:
	Pretax income (loss) from continuing operations		$	16,425		$	(6,748	)	$	9		$	8,188		$	4,874		$	(12,148	)	$	(13,737	)	$	(1,310	)	$	(1,347	)	$	(2,161	)
	Fixed charges			28,757			7,888			35,979			40,191			43,778			49,409			50,998			11,975			13,464			14,278
	Distributions received from unconsolidated partnerships			970			134			965			1,009			2,054			2,621			2,621			652			753			753
	Less-Equity in earnings of unconsolidated partnerships			971			382			437			1,744			2,181			2,613			2,613			400			833			833
		Total earnings	$	45,181		$	892		$	36,516		$	47,644		$	48,525		$	37,269		$	37,269		$	10,917		$	12,037		$	12,037
Fixed Charges:
	Interest expense		$	24,315		$	6,536		$	32,856		$	37,738		$	40,936		$	45,558		$	47,147		$	11,080		$	12,374		$	13,188
	Interest factor of rental expense			4,442			1,352			3,123			2,453			2,842			3,851			3,851			895			1,090			1,090
		Total fixed charges	$	28,757		$	7,888		$	35,979		$	40,191		$	43,778		$	49,409		$	50,998		$	11,975		$	13,464		$	14,278
Ratio of Earnings to Fixed Charges				1.6	x		—			1.0	x		1.2	x		1.1	x		—			—			—			—			—

      The ratio of earnings to fixed charges is unaudited for all periods presented. For purpose of calculating this ratio, earnings consist of net income (loss) plus income taxes and fixed charges. Fixed charges consist of interest expense and the estimated portion of rental expense deemed a reasonable approximation of this interest factor. For the year ended June 30, 2005 on an actual and pro forma basis to give pro forma affect to the offering of the initial notes as if it had been completed on July 1, 2004, we had a deficiency of earnings to fixed charges of approximately $12.1 million and $13.7 million, respectively. For the three months ended September 30, 2005 and 2004, we had a deficiency of earnings to fixed charges of approximately $1.1 million and $1.4 million, respectively. For the three months ended September 30, 2005 on a pro forma basis to give pro forma affect to the offering of the initial notes as if it had been completed on July 1, 2005, we had a deficiency of earnings to fixed charges of approximately $2.2 million. On October 17, 2001, Holdings acquired InSight pursuant to an agreement and plan of merger dated June 29, 2001, as amended. Holdings did not have any operating activities until October 17, 2001. The ratio of earnings to fixed charges for the year ended June 30, 2002 reflects the results for the entire fiscal year 2002 and does not include the results of operations of InSight from July 1, 2001 to October 17, 2001. For the period from July 1 to October 17, 2001, InSight had a deficiency of earnings to fixed charges of approximately $7.0 million.