C****************************************************************
C* 								*
C*								*
C*	DIGITAL EQUIPMENT CORPORATION ASSUMES NO RESPONSIBILITY *
C*	EITHER FOR THE CREATION OR FOR THE CLINICAL EFFICACY	*
C*	OF THIS PROGRAM. USERS MUST ASSUME FULL RESPONSIBILITY	*
C*	FOR ANY RESULTS OR DIAGNOSES OBTAINED FROM THE USE	*
C*	OF THIS PROGRAM. QUESTIONS ON THE EXECUTION OF THIS	*
C*	PROGRAM MUST BE REFERRED BACK TO THE ORIGINAL AUTHOR.	*
C*								*
C* AUTHOR:	SALLY FORSTER					*
C*		C/O DEPARTMENT OF NUCLEAR MEDICINE		*
C*		GUY'S HOSPITAL				*
C*		LONDON, ENGLAND					*
C*								*
C*		TEL: 01-407-7600 EXT 2583/4			*
C*								*
C****************************************************************
	FUNCTION ROI(N)
	IMPLICIT INTEGER*2(D-Z)
	IMPLICIT LOGICAL*1(A)
	COMMON//SAVDES(256),CURVE1(512),CURVE2(512),ICS,ICB
	ROI=1
	CALL PLOT1
	IF(N.GT.SAVDES(184))N=SAVDES(184)
	IF(SAVDES(212).NE.0)GOTO 50
	CALL ROIREG(N)
	GOTO 100
50	ROI=ROIIRE(N)
100	CALL PLOT2
	RETURN
	END